Pool Skimmer Diverters: What Are They, What Do They Do & Do They Really Work?
HTML-код
- Опубликовано: 22 май 2024
- In this video I'll show you what a skimmer diverter is, what they do and if they really work.
Also please watch this video on Understanding The Suction Side of Your Pool: • Understanding the Suct...
Hope you’ll subscribe to my channel and also, please check out my website poolschooler.com for exclusive DIY pool maintenance tools and more direct and priority communication with my for your pool maintenance needs.
DIY Pool Care 
Хобби
With all do respect. Most pools here in Florida built years ago (70's-late 90"s) have that exact diverter and 2 holes in the skimmer. So, there's tons of this type of diverter being used. I've been dealing with pools for over 40 years. That particular diverter works like this: The flap, allows a balance between the skimmer and main drain. If the flap is completely closed, there is still a gap. At that point, the main drain and skimmer are split proportions. Skimmer runs around 20% and main drain 80% since the flap is not air tight. The "float" is designed to save the pump. If the water level falls below the skimmer, the float will block off the skimmer and present 100% suction from the main drain. It works perfectly unless the diverter is brittle from chlorine or the o ring is worn. The design intent was not to drain the pool. If a little air sneaks by, it's OK and won't totally destroy your pump. Obviously, you'd notice a problem shortly after it occurs. Not the best way to do these things but hopefully you'll have a better understanding of the design intent and operation. The original designed diverter was from Pentair and they held the patent for years. I was a Mechanical Engineer for Pentair during the years the diverter was produced. Thanks for your time, sorry for the long read.
Hi Andrew, I appreciate you input and thoughts. I've been mixed on my experiences with diverters. Some good, some not so good. But I thank you for your explanation.
Phenomenal reply Andrew. I have the same Pentair system for over 40 years. No issues with my diverter...😉
why dont these pumps shut off when they detect no water
Good reply. I think the original RUclipsr was either misinformed or misunderstood the purpose of the float valve. It’s not to drain your pool, it’s simply to prevent the pump from being able to suck pure air from the skimmer box should the water level fall below the height of the skimmer box. It’s effective a “fail safe” mechanism to help your pump not get destroyed should the water level accidentally fall. The purpose is not to use it to drain your pool (yes, if it does engage then the suction will divert nearly 100% to floor drain, but again that’s to save the pump from sucking pure air until you notice the problem and refill your pool so that the water level is above the skimmer box)
@@martinvonauthank you for pointing that out. I dont how PoolSchooler is going to explain something he has not clue about 🤣. “I’ll tell you if this floater works or not, eventhough I dont know how it works.” Lol
Thanks for covering your take on diverters.
Great information, thank you for sharing this!
Make since! I agreed with you. perfect
I inherited my father's home that has a Shasta built pool from 1976. It also has the two-hole skimmer with a diverter. It has a Pentair system. I personally keep the lower flap halfway open in the diverter. I also have to say in the 40 years my father has owned the pool, up to the last three years I have taken over, there has never been a problem with this diverter and the pop-up system of the pool. What was built in 1976 which was then state of the art to me, is still state of the art today and can still clean my pool better than any non pop-up system can. The pool is located in Glendale, Arizona. I believe you are also in Phoenix. You have an open invitation to come look at my pool...😉
I appreciate the offer and I am delighted that the system you have in your pool is working so well for you. I have a few clients who have a pop up system that works well and some of my clients' choose to keep the diverters in place as well. But some have had different not as positive experiences with both and choose to not use either.
My opinions are simply, that, opinions. And are based on my 20+ years of servicing pools around my area. So I offer my opinions on some subject matters such as these and allow my viewers to make their own decisions.
If you're system is doing the job for you and you really like it, that's fantastic.
It's there to protect your pump. With my pool it has nothing to do with any type of pool cleaner. If something like to many leaves in your basket or low water level cause your water from going to your pump, the diverter will divert water suction to the pool drain. This will then stop your pump from running dry. If you slid the stopper totally over the hole, you will constantly draw water only from the poot drains.
I have an old pool that came with a house my wife and I bought. I bought a diverter and its a great little device.
I usually have the diverter door, a little more than half way shut and with a 35,000 gallon pool; running the motor at 2000 rpms, the skimmer flow rate works great. Of course you also have to find the right balance when it comes to your water level.
I know the rule of thumb is usually you want your water level half way up the skimmer entrance.
I disagree with this due to a couple reasons. The higher the water level, the higher RPMs I have to set my motor for it to enough surface water flow in the skimmer itself - and thats including adjusting the diverter door. And that just costs more money to go from 2000 to 2500 rpms. Also, high level of water usually makes the motor and skimmer work less efficient - meaning the surface water moves a lot slower to the skimmer.
I usually have my water level at about 1/4 to 3/8 height of the skimmer entrance. This seems to work best for my pool and I can run the motor at A LOT lower rpms with better efficiency.
Another reason why the diverters are great :
My backyard has three different types of pine trees that shed like crazy in the summer and get into the pool - usually staying on the surface of the water. If there's enough needles that get into the skimmer and clog the basket while preventing water from entering, the diverter will shut and it works in a way that the pool runs by using the floor drain - like you mentioned. However, for my pool, it does prevent air from going into the motor, the filter, and coming back out the return lines. Im not gonna say its air tight or anything, but with my experiences, the motor has enough suction to seal it enough for a tight fit. Then the diverter acts like a door and shuts the skimmer down when its clogged and then diverts only drain water into the motor and filter and keeping the pool running while being consistent (at least for circulation purposes) and preventing air from going in the motor.
Its also great for general circulation as well. I dont think of floor drains as any type of vacuum mechanism for only for dirt of debris as much as I think of it as a circulation drain that filters out the fine particles.
It might not be a great investment for some pools, but its a great device for mine.
Anyways, thats my thoughts and ideas for whatever its worth. And I still gave you a like.
Correct me if I'm wrong here but doesn't your completely clogged skimmer basket block/restrict the water flow? Thus only leaving the option to suck from the floor drain? That's how it would work without the diverter right? I also believe the diverter shut off float will still float if it's still completely submerged leaving the diverter open and not until the water level drops below the float will it drop down and hopefully seal off so it sucks from the floor drain instead of just air from the dry skimmer potentially burning up a pump. I think of the diverter device more as safety seal for when the pool level is to low to keep the skimmer full of water. I would think the only important reason for limiting off the wonderful time saving skimmer is to help suck down newly added chemicals for better even mixing for accurate test strips. I just started learning this tonight but it makes sense to me.
Also it sounds like your skimmer is missing the very important Weir gate or door that ensures that all the skimmer suction stays at the top of the water level only "skimming" the top instead of just pumping water from a big rectangular hole in the side of your pool. Essentially what you are trying to accomplish by keeping the water level just above the bottom of the skimmer entrance. Sounds a little tedious to try to keep it at that tight level year-round. They also help trap the debris in the skimmer instead of floating back out when the pump shuts down.
@@christ6370 the diverter stops air from entering the pump - thus turning the main drain into the only flow of water going to the pump. When enough debris clogs the skimmer, water will be restricted to the pump and it will begin sucking air.
The diverter solves this problem and shuts the skimmer down while still circulating the water in the pool.
@@christ6370 and of course I have a skimmer door
I use the diverter once a month, just to suck out the dirt and debris in the pipe. All other times I have my hayward pool cleaner connected to the auction pipe. I have drained my pool a few times completely and removed the main down cover to find it filled with dirt, tiny rocks and some green algae growing since the water there goes not get filltered through my sand filter. Hence the once a month use.
Thats a great idea. Thanks for sharing.
I would think that "some air" is better than "only air", I also noticed that some pros and suppliers do not know everything. So don't count on them to weigh in on your theory. Best test is a test.
Theoretically the body of water is ONE therefore the suction at the bottom of the skimmer to the pump IS pulling water from the main drain at the same time as from the surface. It theoretically does not have to "pull" water from 5 feet down since the main drain also has 6 feet of water resting on it leaving only 1 foot of "head" to pull, which is the same (ALMOST...maybe 1.5 inches more ) as what is being experienced in the skimmer.
The reason I emphasized "theory" is that the sediments in the main drain are of different characteristics and thus would need added suction to lift them to and through the base of the skimmer.
If the pool is at normal level and we close the skimmer flap, the float valve drops and we should get a suction from the main drains. This test would result in a false idea as to what would happen when the water level drops beneath the throat of the skimmer. The reason for this is that closing the flap in itself is not water tight and so some water still falls through and slightly floats or breaks the seal on the float valve.
Having said all this I would still agree with you that the seal may not be perfect at some point in the life of the valve or even maybe ever, yet some air beats only air going in my pump. If my pump doesn't trip before burnout I hope I hear the cavitation in time to save a good buck.
The truth is that the more ideal setup is with independent valving controlling suction at the pump house.
Nice video. I really enjoyed it, as our pool has a diverter, which we refer to as the 👽👾"flying saucer!!" We also have an in-floor cleaning system and as far as I know, the flying saucer is the only way to adjust the suction between the main drain and the skimmer. It DEFINITELY works for our pool ,as if it's out, the main drain doesn't work AT ALL,which defeats the purpose of having the in-floor cleaning system, I believe.
Lastly, in terms of preventing the pump from running dry if the water gets TOO low, MY diverter DEFINITELY does work, as we actually forgot to turn off the drain hose after a heavy rain one time, which caused the water level to drop WAY below the skimmer. Fortunately, the diverter float worked properly and pulled water from the main drain. I actually have tested it Since then, and it ALWAYS works well; you'll hear a" thump" as it seats itself and then it'll pull water directly from the main. One difference, though: mine has an O-ring/gasket on The bottom and underneath the float -- I didn't really notice Them on the one you were holding, so maybe they make a difference.
Thanks so much for sharing this info. I am glad the diverter actually did work to help save your pool equipment from the water being too low. That's fantastic. I suppose two things>Making sure the float inside "the flying saucer" is in good condition (not cracked) and you have a gasket as you describe then it looks like it can prevent damage to the equipment from low water. And I am glad your diverter works well for your pop up system. I really appreciate the info.
@@PoolSchooler
No problem at all. Again, it does a pretty good job for my pool -- although I wouldn't mind having a Jandy valve to regulate the main drain/skimmer suction -- so I just wanted to give you some feedback. As you mentioned, I think that perhaps your customer's diverter should be replaced; or at a minimum, the O-rings should be reinstalled, as I think they'd improve the seal on both the diverter base and the float. Please keep making the informative videos!!👍
If you have a in-floor pop-up system like I do, you need that diverter!
Enjoyed your explanation of the skimmer function, what is your opinion of the skim- around baskets ? Allegedly speed up skim function.......
I personally don't like them. I have one client who had one and they hated it so we went back to a standard skimmer basket.
Are the diverters necessary if my pool has floor cleaners ( pop ups ) ?
@@Mr69volks As I said in the video, that would be the time when a diverter would be applicable and useful.
Good to see someone else battles pine trees..... heck, those are probably from my neighbor's stupid trees.
Believe it or not I have a pool with a leak and it doesn't have any valve to shut off the skimmer and this does work when the water level gets low. Otherwise the pool loses prime and the pump gets red hot
That’s the main reason. I have it due to my pool lacking an auto fill.
If you dont use the diverter with In Floor pop up heads the your drain pipe will hold debris. I just had AZ Leak Detection come out to find some leaks and as soon a they started to blow out the lines to pressure test the Spa main drain pushed out years worth of debris because I wasnt using the diverter. Now I have the diverter in my Spa clean out only and its keeping the main drain clear.
You are right. I should have mentioned that. That's the main time I think a diverter is needed. So thank you for commenting. 👍
Which AZ cities do you cover on your pool route?
I dont have a divertor in mine, but its set up like this, but i dont see any room for one under my skimmer, almost like my basket is designed to divert it? DO some of these not use divetors and use the baskets to pull from the main drain? it seems pretty bad design but that what i got.... no o-ring area or anything down there, just two holes..
I have an in-floor cleaning system and a dedicated suction. Do you recommend using skimmer + main drain, or skimmer + vaccum, or all 3?
I’m not a fan of in floor pop-up cleaning systems. That’s just my personal preference based on my experience. My favorite set up is is skimmer with a dedicated vacuum line on the suction side of the pool. But if you have a in floor pop-up cleaning system you would need to convert your pool to a suction side vacuum. I did a video on how to do this using A Pentair VacMate check it out, here’s a link: ruclips.net/video/gSfbNv4sV_M/видео.html. Hope it helps.
Thank you explaining the diverter!!! No one has been able to explain this !!! I am taking mine out
There's others stating similar comments, here's my 2 cents.. The device can divert what amount needs drawn from the floor drain or skimmer. I keep my flap 50-50. If the water level gets too low the ball float inside drops and will shut of skimmer intake and 100% will be drawn from the floor intake. This will also prevent the circulation pump from running dry. Also it can help the start up cycle by being primed with water.
Thank you Patrick, I appreciate your comment.
I do the same with my diverter. No problems in over 40 years...😉
Hi Ken. My skimmer has in hole. Does that change any of this information? Also wondering about your thoughts on pool Rx
It may. If your skimmer has only one hole it's probably direct to the pump and you don't have an active floor drain OR you may have a dedicated floor drain suction feed. I'd have to see how your system and plumbing is set up to better comment. If you'd like to email me a video and/or pics of your equipment set up (and if you have a floor drain in the pool) I may be able to be more accurate. kennypoolschool@gmail.com
Please help! I have a part that looks different. (This is the one I have: SKIM/MAIN DRAIN VALVE ASSEMBLY SP1082GV) It has a butterfly valve. If I understand what you’re saying, the butterfly valve should be open? And the only time it should be closed is when we are draining the pool?
Typically the adjustment on the bottom of the unit can be opened or closed as much as you want so some or more of the suction can be "diverted" to the floor drain. When you're draining your pool (although I recommend rent a HD submersible pump to drain your pool and NOT the diverter) they would say you close the flap completely so as to get all the suction to the floor drain.Watch this video for further explanation on why I don't recommend using the diverter method to drain your pool: ruclips.net/video/HFKoombKtPg/видео.html
My diverter does prevent the skimmer from going dry. We have had a really dry summer and a few times I have found the diverter saving me.
I am happy to hear that your diverter is working the way it’s intended. Too often I’ve seen them not work for various reasons. But I’m glad it’s working for you.
I have a new pool with an infloor system and it seems the floor drain doesn't ever suck small dirt, even when I sweep it to the drain....what if I closed the diverter flap? What will it do? will the pop up heads still work...seems like they really were not worth getting because it doesn't seem to pop up all the way unless im at 2500 +
Actually you would want to shut the diverter flap in order to divert some of the suction to the floor drain and that should help. It shouldn't affect your pop up system's efficiency. I say shouldn't because I've seen far too many pop up systems set up wrong. But if they set it up correctly you should be fine.
I have a new pool with a infloor system that seems to only pop up the venturi heads when its running 2900 and up speed...always clean my filters 1 time every 40 - 50 days in ....I have no water features, only an 18" raised spa with a spill over. Any ideas...the other thing is that I never see any debris flow into the main drain when I see tini leaves just sitting by the drain?
Hi Tony. Ok, so with variable speed motors at the lower speeds they don't move the water fast enough to activate the pop up heads. So you would definitely want to run the pump for at least 5-6 hours on 2900 or faster. Then lower speed for another 2 to help continue filtering the water.
As far as the leaves sitting by the drain. Are the openings in the drain cover large enough for the leaves to get through? Typically (and another reason I don't prefer pop up systems) is the openings in the floor drain cover are too small to allow leaves to get through. OSHA did this to prevent children from getting fingers or toes stuck in the openings and possibly drowning. So it was a good thing to do but put a huge kink in the pop up methodology. So you could use the diverter to allow some of the suction to divert to the floor drain AND at least it should help with the dirt but probably not the leaves.
Have you ever considered converting you cleaning system to a suction side vacuum using a VacMate ? I did a video on that in case you're interested in exploring that possibility. AND I would recommend the Barracuda G3 pool vacuum if you go that route: Heres a link to that video: ruclips.net/video/gSfbNv4sV_M/видео.html
Hope this was helpful. And Hope you'll subscribe to my channel.
So I have an infloor cleaning system and the diverter. But I also have this check valve that is on a spring which is supposed to go into the hole that goes to the bottom of the pool drain. I am not sure if I should be using that with an infloor cleaning system. But it sounds like I should use the diverter at least at 50% or so so that my infloor is working good. Does that sound right? Its a U3 Skimmer system.
It does but I'm not sure about the check valve. If it's to prevent water from flowing back into the pool via the floor drain I'd find that interesting and uncommon for my area. I'd actually like to see a picture or video of what you're talking about.
@@PoolSchooler I am in AZ as well. According to the instruction sheet that came with it, it says" Check Valve prevents suction through equalizer line unless the water level in the skimmer drops so far that the float valve closes. When float closes, check valve opens allow pump to draw water from equalizer wall fitting, preventing damage to pool circulation pump." So it sounds like it closes off the line to the drains on the bottom of the pool unless the float closes. I am going to assume I don't want that in there since I have an in floor system. I am closing the opening on my float to about 60 or so so that the drains get more suction. I know that puts less suction on the skimmer but I don't have many trees or anything causing much on the surface. I am more concerned about dirt on the bottom. But easy enough to adjust as needed.
You can see the setup on it if you google "u3 skimmer installation" and check the link that comes up for
U-3 Skimmer - Pentair.
@@josephtuccillo6438 OK gotcha. I'd suggest following the manufacturers recommendations on their particular product.
The only difference from drawing water from the floor drain and from the skimmer is the head loss in the piping. Not the elevation of the floor drain. The elevation of the pool water is what determines the suction head at the pump. If the pool were 500ft deep the only difference in what the pump sees is the head loss in 500ft of piping not 500 ft of gravity.
Well said. Around 3:40 when he starts talking about how it should be harder to suck water from floor drain my physics intuition kicked in and started looking for comments and here you go.
@@jisyang8781 Yes, Right,
I was watching- "Are you smarter than a 5th Grader"
Answer was "Water seeks it's own level"
The pressure at any point within a body of water is equal, creating a stable level. So, the pool water from the main drain is at the exact same level and pressure as the Pool water level at the skimmer.
My diverter was broken (the part where the screw attaches), and lately my pump was failing to prime every morning. I replaced the diverter with a brand new diverter and now i no longer have that problem. Is there a connection?
There should not be a connection.
I got the exact same setup and a crack in the same exact spot.
My pool has a blocked off at the main drain. I collected a lot of palm seeds in the floor drain in the deep end of the pool. I think that was the reason why the previous owner cap it off at the skimmer. I have a pool man but he doesn't collect all these seeds that settled at the floor drain all these year. I just reinstalled newer pump and understand more how pool circulation works. My question is should I remove that plastic plug at the skimmer and buy this diverter to use the main drain ? I'm going to use king drain bladder and blows everything before using the main drain. Let me know thanks.
I'm going to buy pool cleaning equipments plus vacuum device to vacuum that pool manually. I'm looking to buy a automatic vacuuming too. If I have everything, should I even look into opening that plugged main drain back to service? Thanks
I'm not sure the diverter would be effective in sucking up the seeds you're talking about as they may be too heavy. But it may be worth a try. I would suggest putting in a suction side vacuum (I'd suggest the Barracuda G3) using a VacMate skimmer attachment. Here's a video on how to do that. ruclips.net/video/eagXAKxN8zM/видео.html.
@@PoolSchooler thanks for fast reply. I got in trouble. So the day after I posted the comment, I went out and bought vacuum tubing and long pole to vacuum the pool floor without leaf canister to catch big debris. I think I sucked up something that is now clogging the suction pipe. I do not get water rushing into the skimmer like the day before it was obvious so strong when I just installed new 1 HP Century motor plus housing. Today with same motor I barely got any suction, there must be something preventing water coming into the suction pipe. I do get 25 PSI at the tank reading, return jet is not so strong compared to previous day. I used king drain bladder from the motor and from the suction at the skimmer port. I don't get anything that came out. When I was running black bladder at full blast, I didnot feel any water jet come through at the skimmer when I placed my hand over the hole. Should I go head and use my 40 foot snake drain? Let me know what you think I have a video I record using cheap sewer camera . Let me post the link. Thanks. I'm so frustrated. Today, Even after I changed out to 1.5HP motor it would still not as strong as the first day before I started vacuuming the floor at the floor drain that has so much debris. Thank you
@@TruongLe-eo8kh Yes I'd suggest snaking out the line. Something's got to be plugging it if you have the suction dedicated to that line and are getting no suction.
@@PoolSchooler ruclips.net/video/Mh3B1UzO4bA/видео.html
@@PoolSchooler i don't know what is clogging the suction line. I wedge the black bladder into suction line at the motor and turn on the water at full blast. The bladder expanded and wouldn't shrink when I turn off the water. It is holding on with a lot of back pressure. This means the bladder is pushing water against some thing in the pipe.
I was told it is like a check valve if your water gets too low it will suck down shut off the skimmer so it won’t burn up your pump
It is that as well, however I've too often seen them fail to truly seal and thus not do their intended job in that area.
Pool in our villa complex has a diverter and it did not work when the water level dropped due to leak.
That's kind of been my experience but one person commented that theirs worked great to prevent such an issue BUT said their diverter had a gasket where the "float" set so as to create a seal. So in their case it worked.
Needs the o-ring on the skimmer bottom and the float. Most skimmers have lost the o-rings.
👍👍👍
Without this thing my main drain has no suction. I’ve heard that main drains account for 75% of water circulation. In your opinion do you think this engineering is meant to have the skimmer be 100% of water circulation ?
So if you have a dedicated vacuum line you don't really need any suction to the main drain. The vac would take about 2/3 of the suction and the rest directly to the skimmer. I'm not sure as to the percentage you heard about (75%). If it's pulling that much from the floor drain then you 're losing that much from your skimmer and it won't do it's job very well. ALSO, you'd probably have to open the diverter flap completely to get the most suction to the floor drain AND that water has to move "up hill" so it'll pull from the easier source (which is the skimmer since water seeks the path of least resistance). As I said in the video, I'm not a really big fan of the diverters, but about the only time I think they're ok is when you have an in floor popup cleaning system.
Pool School thanks for your response , I don’t use a vacuum or pop ups but I use a robotic cleaner. I guess it’s the same concept. I noticed even with the diverter float installed, the main drain suction is weak. So I think you are right the skimmer is the way to go for this type of set up.
What is an in floor cleaning system?
This video will explain: ruclips.net/video/m6h7Lh76Vvg/видео.html
What I noticed on my pool the 2nd hole to my skimmer goes nowhere and unfortunately has no diverter valve and no weir door.
A second skimmer hole that goes "nowhere" is common in pools that don't have floor drains. So you don't need a diverter valve. ALSO you can get after market spring loaded weir doors for you pool if you want to
I'll get the skimmer weir door eventually I'm glad I got a new energy efficient pump and new pool filter last year. Money well spent!
Every pool without auto fill needs a float valve.
My diverter is missing (no idea how/why lol), but it seems my floor drain is feeding the vacuum 100% and so I am not skimming the surface of the pool, there is no pull into the water.
Where do you have your vacuum plugged in? And is it a suction side or return side vacuum?
@@PoolSchooler floor vacuum has a port on Tue side of the pool like your video. I think my vacuum is positive pressure there is a little snake which shoots water out the back to push the vacuum lol
@@petertwiss356 So you have a pool "sweep" which works on the return side of the pool. If you want to put in a suction side vacuum you'll probably need to do it through your skimmer. I'd suggest using a VacMate to do that. I did a video on it. Hopefully it'll be helpful. Here's a link to it: ruclips.net/video/eagXAKxN8zM/видео.html
@@PoolSchooler thanks!
I would rather have valves at the equipment area that control where the suction comes from because I don't like putting my hand in the skimmer because I am afraid of being stung by dead bees or wasps.
Well, yeah, but many, maybe most pools aren't plumbed that way. I know mine isn't. It's a lot cheaper to run one line straight into the pump than to run multiple lines into multiple valves (or a gang valve) before feeding the pump. And gang valves will fail at some point. Most of the pools in my area run a single drain line to the pump.
First and foremost the skimmer diverter is to protect the pump from losing its prime and water to protect it from burning out!!
Secondly, the diverter allows the user to adjust the suction/flow to the skimmer by moving the sliding door more open than closed.
You are right, the skimmer diverter is very mis understood by a valuable and necessary part of your pool circulation system!!
I appreciate the comment. I've not had good experiences with skimmer diverters personally. But I appreciate your input. Thanks
I have watched other videos where they actually show where it works when the skimmer is closed up. It doesn't have to be a theory, just close up the skimmer and see if it works. Easy!
Yep - mine works.
I have pine trees in my backyard and when they start shedding, they go right into the pool and then clog the skimmer. Thats when the float in the diverter drops when it reaches a point of not enough water in the skimmer. Thus stopping the skimmer from sucking a bunch of air in the motor while switching over to the main drain and still providing water to the motor.
The skimmer will be shut down, but the circulation never skips a beat.
These devices are great.
It sounds like you don't like diverters but aren't exactly sure about the facts first hand. Please stop saying "theoretically" so much.