Filter Sand in Your Swimming Pool? | Dealing With Broken Laterals
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- Опубликовано: 18 май 2024
- In this video, Mark goes over the causes for finding filter sand in your swimming pool, as well as how to fix it!
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Video Timestamps
00:00 - Intro
00:19 - Confirming it's sand
00:57 - The cause
02:02 - Removing the sand
02:37 - Removing the laterals
03:10 - Inspecting the laterals
05:57 - Choosing the right laterals
06:59 - Putting the laterals in the tank
07:58 - Important tip
How to change sand in your in-ground pool filter: • How to Change Sand in ...
Video Links:
Lateral Assembly:
S164T/S166T lateral assembly: hallmarkpoolsupplies.com/p-17...
S180T Lateral Assembly: hallmarkpoolsupplies.com/p-17...
S210T Lateral Assembly: hallmarkpoolsupplies.com/p-20...
S220T Lateral Assembly: hallmarkpoolsupplies.com/p-17...
S244T Lateral Assembly: hallmarkpoolsupplies.com/p-17...
Individual Laterals:
S200Q Lateral (threaded): hallmarkpoolsupplies.com/p-16...
S200QN Lateral (ball): hallmarkpoolsupplies.com/p-17...
S240Q Lateral (threaded): hallmarkpoolsupplies.com/p-16...
S240QN Lateral (ball): hallmarkpoolsupplies.com/p-16...
Jacks Lube: hallmarkpoolsupplies.com/p-87...
Thank you for your great videos, very professional and easy to follow.
Absolutely brilliant videos for maintaining pool equipment. The best coverage by far. A huge thank you from me.
Thank you for your video, I've learned alot from you. Your a life saver 👍
I have a 16 foot, 42 inches deep round, above ground pool and it turned green a week ago. Today, I added two gallons of Wamart's Chlorine from the pool area at $5.69, and 6 hours later, it turned baby blue! I removed bugs and leaves and other small debri and now my pool is now clean. Easy. Tomorrow, I will clean the filter and go swimming!
Wal-Mart chlorine. Lol. Sure ya did.
Valuable information Sr thanks.
very very helpful. Thank you Mark!
Thanks, very helpful !!
Very helpful thank you
Thanks, this is exactly what my pool is doing. Sand everywhere on the bottom. I was able to resolve this based on your video👍
Great info!
Really helpful
Thank you
Thanks for the excellent video & for pointing out the older style of lateral screws in & doesn’t fold up like the newer model of lateral valves.
good sir thank you
hi Mark like your comment inground pool jets work fine only when i connect the hose in the skimmer to vacuum the pool jets stop working thank you
Good helpful video
When I pulled up my valve assembly, like you suggested in your video; the central pipe and and lateral assembly also came up with it a few inches.
Getting it back down without damaging the laterals seems impossible without some kind of vibrating device (maybe an oscillating saw without a blade on the outside of the filter?) to liquefy the sandy water and reseat the assembly on the base, so unless there’s a trick you know of, I imagine I have to wet dry vac the sand out and resettle the lateral assembly.
Before I went down that path I thought I’d confirm my observation?
If this has happened, you will have to remove the sand to put the lateral assembly back in. You can lightly sand the end of the standpipe and lube it, before connecting back to the valve. This will help when removing in the future.
Thanks!
Thank you very much.
Liked the video just wished there had been some example pics of the sand vs dead algea.
Hi Mark, thank you so much for your very precised and well explained videos. Just got my first pool and it helps a lot. I have a Jaccuzi sand filter. I watched your video where you show each position of the level. When I'm doing a backwash for 1 minute than a rinse for 30 seconds and put it back to filter switching off the pump in between each steps and turning the level clockwise, I'm always having some water continuing to leak down the waste drain when back to filter. What could be the cause? Thank you in advance!
In the filter position, you should not have water leaking out of the waste line. You will have to check your multiport, inside the valve the key assembly may not be seated properly and needs to be repaired or replaced. You need to also check the gasket, if damaged or wore, then replace. Thanks for watching.
Very informative video. We have been getting sand in our new pool pretty much since day one. Is it possible to have a broken lateral in a new filter?
Anything is possible, thanks for watching.
Love your tutorials. Used this video to change my on sand about a month ago because I was getting sand in pool. I inspected laterals and saw no cracking or breaks but I’m still getting sand. Any suggestions. I might mention that I’m having to manually vac to waste because vacuum is broke at the moment and just vacuumed yesterday and today theres noticeable sand. Thanks
If you have filter sand in the pool it will only be on the floor by the returns (jets). If what you are describing is all over the floor of the pool, this is more than likely mustard algae. Mustard algae looks like sand and you will have to treat, kill and vacuum to waste, if not it will keep coming back. If you have sand on the floor below the jets only, then you will have to open the filter and remove the sand and inspect the lateral assembly again. Thanks for watching.
Great video! Do you have a video for a side mount system? I got all my sand vacuumed out, but how can you inspect the laterals (fold up style)?
I do not have a video on a side mount filter that pertains to the lateral assembly. The assembly is similar but is much harder to inspect. The lateral assembly can be removed but you have to remove the two side screws on the lower elbow assembly inside the tank. Thanks for watching.
I have old s240 Hayward which new lateral assembly do I need? Like your videos very thorough
For the S240 filter you would just replace the laterals (old style threaded), they come in a 10 pack. Here is the link if you need them.
hallmarkpoolsupplies.com/p-16270-sx240dpak10-10set.aspx
@@HallmarkPoolSupplies thanks a lot
Thank You excellent video, I have an INTEX2800 SAND FILTER brand new, Im getting very little sand and little Debree back into the pool , size of a pea but i didnt think I should be getting anything , what am I doing wrong ? brand new sand #20 LIGHTHOUSE from NAMCO , ITS FRUSTRATING, I have emptied the tank, INSPECTED EACH LATERAL I couldnt see any damage, they all have slits in them so its hard anyway
Make sure you have the right amount of sand, sometimes to much sand can cause this. You may also need to backwash the system thoroughly. If you have any questions feel free to contact me I will be glad to help.
Great video thank you! My lateral from top to bottom is 28", please tell me what model of hayward filter I have? Thank you! No stickers left on it.
According to your measurement, you have a S244T. Thanks for watching.
Good content. Plan on changing my sand out soon and this is good information. Question? What cause back pressure that when you turn off the pump it cause water to blow up through the screen basket.
You need to backwash and rinse the filter thoroughly. Thanks for watching.
@@HallmarkPoolSupplies how do you find the main O-Ring for the pentair valve 272526? Will need one prior to changing out the sand
@@stripermanly If you are referring to the o-ring between valve and tank, here’s the link.
www.hallmarkpoolsupplies.com/p-3673-272541.aspx
Thank you. I bought tech mix pool filter sand last spring. I got sand in my pool. Just inspected laterals. Everything looks perfect. I don't remember having this prob B4. Are all pool filter sands equal? It doesn't say #20, just pool filter sand
Most all filter sand is # 20 silica, there may be other grades but if it is labeled pool filter sand you should be fine. If you have inspected the laterals and the assembly and everything is good then you may be dealing with mustard algae. If this is all over the pool, it’s more than likely dead algae which looks like sand. If it is sand it will accumulate at the base of the returns only. Thanks for watching.
Hey Mark. I love your channel. I was changing out my sand yesterday and when I loosened the multiport, the pipe on the lateral assembly did not disengage. I sprayed some lubricant on it but it's not budging. I have a Pentair SD40. I was still able to vacuum most of the sand out except for right at the center floor, where the assemble is supposed to sit. Do you have any tricks or recommendations for this? Thanks.
Paul
You should be able to remove the standpipe from the multiport valve. Wiggle the pipe or use a pair of channel locks but be careful. Once you have removed the standpipe you can lightly sand and lube the end of the standpipe. You can also lube the underside of the valve where the standpipe goes in. This will allow the standpipe to go back in easily, and it will also help in the removal of the standpipe down the road. Thanks for watching.
@@HallmarkPoolSupplies: Hey Mark! The channel locks worked great and I was able to get the pipe off and changed out the sand. I also lubed up both of the pieces for easier access next time out. Thanks again.
Paul
Thank for your videos. I just got the same filter for my salt pool. Is brand new and it blows about a cup of sand after each backwash. I open the filter and the laterals are in perfect condition and the multi port valve gasket looks good. Any other reasons to why my filter is doing this...?
If to much sand was put into the filter, then this could be the problem. The sand can keep coming out until it self levels. If you put the correct amount of sand in the filter then you should be okay. If down the road this keeps happening then you will have to open the filter and inspect it again.
Thank you so much!! What was the name of the lube you used, I couldn't catch the name?
Jack's lube, there is a link in the description.
Howdy Mark, I sure do need your help. I purchased a pool package from a seller on EBay but it didn't come with a Hayward filtration system, and I'm having a real big problem with the Lateral system. It's made very cheap and there are open sections where the laterals attach to the hub, and the filter sand is being sucked through and pumped into the pool. I want to get rid of the entire lateral system that came with the pool filter and up-grade it. I'm wondering if it's possible to replace the lateral system that I have with a better system? my system is 26" tall, and laterals are 13" across. Is it possible that one of the lateral systems from Harward will fit my tank? The tank itself is 16" round. I will try to ad to add the description on my filtration system to this post. Have a look and let me know what you think. Thanks for your time, and great videos. Thanks for sharing them with all of us.
Rx Clear® 16" Patriot Above Ground Swimming Pool Sand Filter w/ Valve
Item Number: 481610
The Rx Clear® Patriot Sand Filter is perfect for your above ground pool! This made in the USA sand filter has a molded corrosion-proof body for all-weather performance and extended system life. Set-up is easy with hoses included. And each filter is individually tested to ensure quality and reliability.
Molded corrosion-proof body for all-weather performance and extended system life
Accurate and visible pressure gauge
Universal filter base
Hoses included
Deluxe 7-position backwash valve with 1.5" connections
Drain cap with strainer for easy maintenance and winterizing
Each tank is individually tested to ensure quality and reliability
Specifications:
Model #: PT16
Tank Volume: 15 gallons
Diameter: 15"
Connection Size: 1.5"
Carton Weight: 22 lbs
Carton Dimensions: 15" x 15" x 36"
Sand Requirements: 125 lbs. Replace sand with 3 boxes of our Luster Filter Media
Features:
ABOVE GROUND POOL FILTER - The Rx Clear Patriot Sand Filter for above ground swimming pools. Excel in hydraulic engineering that provides an elusive combination of high efficiency, quiet operation, and longevity. All components designed for maximum performance and economy in an above ground swimming pool filter.
CLEAN AND SAFE WATER - This filter is designed to handle the filtration needs of many of today's pools. It provides an efficient, easy-to-use operating system that will assist in keeping your above-ground pool water crystal clean and safe for swimming.
EASY TO INSTALL - Includes a 7-way backwash valve with 1.50 connections which provides simple control of water flow. It comes with a universal filter base and user’s manual along with a 3-year warranty. This filter tank is only intended to be used with Rx Clear brand pumps. Do Not Use with high pressure (full rated) pumps or pumps not specifically designed for this sand filter.
Warranty:
3-year limited warranty
Unfortunately, most manufacturers parts do not interchange with other brands. You can definitely upgrade your system but you will have to replace what you have. If you need help doing so feel free to contact me and I will be glad to help.
If we're my lateral support attaches to the pool to filter is the filter broken
How long is the PCV pipe on the lateral on a S166T92s
I believe that the stand pipe on a S166T is about 14”. Thanks for watching.
@@HallmarkPoolSupplies thank you
I have a Hayward model S244S. An older model I assume. I can’t seem to find an exact match for lateral replacement. Can you help?
I have the laterals for both the old style and new style S244S filter. Do your laterals fold up or are they threaded and screw in ? Let me know and l will be glad to help. Thanks for watching.
I gotta say that Leslies told me the sand was due to my sand being too old. So i changed all the sand, inspected my laterals, and they didnt seem damaged, so put in new sand and rehooked everything up. Pretty sure im still getting sand through the jets. So perhaps i need to take the laterals out again and to Leslies for inspection? Such a massive pain in the ass. What's the best way to get the sand out of the pool once it's on the bottom? An external vacuum?
You can vacuum to waste, thanks for watching.
what type of unions are those? Need some 2" ones so I can maintain without having to cut. Thanks
I carry the 2" unions on my site, here is the link.
www.hallmarkpoolsupplies.com/p-8541-2s-pvc-flush-union.aspx
Nice of you to gonto the trouble and time in prepping this video. I hate sand filters. Whenever I get the chance, I replace them with cartridge filters. I just don't see any reason to have a sand filter. If you are paying for electricity to circulate water, why run it through a filter that let's algae and other particles straight back into your pool? Surr cartridges are a little more work to clean, but waste WAY less water to clean, they need cleaning less often due to their much larger filter area, and don't have a MPV that gives trouble. I just don't see why sand filters are so popular. Worst of all, they are hard work to commission and decommission.
Sand systems are more expensive to buy, but much cheaper to operate. Sand systems are also more forgiving to operate than cartridge filters because they do not filter as fine as cartridge filters. Sand on average is changed every 4 to 5 years and is also self cleaning. It costs a lot less to change the sand than to replace the filter in a cartridge system. All filter systems work well, (sand, cartridge or DE) and it is a matter of preference. The size of the pool and where you live also makes a difference in which system will work best for you. Thanks for watching.
I am just about ready to change my sand, should I change the letterals at the same time? My letterals are original from 8 years ago.
Inspect your laterals and if they are in good shape then you do not need to replace them. If you need to replace, there is a link in the description for these parts. If you have any questions or need help feel free to contact me I will be glad to help.
I have a S244 top mount older Hayward filter. I replaced the laterals and the center tube and refilled with sand.I am now getting sand in the pool. I noticed the old center pipe had an adhesive that was on the pipe where I goes into the lateral assembly but I was told I did not need to cement the pipe to the assembly. The pipe does not fit snuggly on the lateral assembly. Could this cause sand to get in the pool?
Yes, however the stand pipe on the lateral assembly from Hayward is factory glued and sealed. The top of the lateral assembly which goes into the multiport is not. If your stand pipe is loose in the assembly then you will have an issue. Thanks for watching.
I am getting algea blowback right out of the blue..was working fine. Can algae just get through? Ive replaced the sand , backwash and rinse for a minimum of 1 min. I dont know how its getting through...thank you
You may need to backwash and rinse again, doing this back to back will give a more thorough cleaning of the filter.
I have a sand filter that says Millennium. It’s only marked as 27in. The laterals do not twist on or lift up. I measured the lateral from top to bottom and its 30in. What lateral assembly do you suggest I need?
I believe this filter model is by Astral, I would recommend to contact the manufacturer to locate parts.
How do u get the laterals assembly out when the 2 water flows pipes r separate and L shape?
On most side mount filters, the laterals are attached to the bottom elbow assembly which is attached to the bulk head. In order to remove the assembly you have to take it apart. If you are just removing or replacing the laterals you can unscrew them, if the elbow is damaged then you have to unscrew both top and bottom unions on the outside of the filter and remove the bottom bulk head to replace the elbow assembly.
i have a new sand filter with no lables it is larger than my 16 inch hayward need to know what size lateral or if i can use old lateral
If you can find out the size and model you have that would be helpful.
Do all lat assemblies either unscrew or fold up? I have a Blue Torrent sand filter and it seems that they do neither.
Most filters do, however some blue torrent filters have laterals and some use a screen at the base. I would refer to an owner’s manual for the model you have.
Hello,
I have a Hayward S180T. I recently purchased a new lateral,( Sorry I am just seeing your site), however, sand is still coming into the pool. Any suggestions? BTW, I put 150 pounds of sand inside.
You have the right amount of sand, if this continues you may have to take the sand out of the filter and recheck your lateral assembly. Thanks for watching.
Hi Mark, your video is right on time; thank you! I have a Hayward s310s with side mount variety-flow control valve. I have emptied and pulled the lateral(s) and they're folding properly. I can't see any crack, holes or broken areas when I inspected it throughly but still wouldn't mind replacing it for just purposes of being old and not knowing where the sand is escaping from. I am going to replace the rubber spider gasket on the multi-valve and have found the lateral component that replaces the one in the s310s with Hayward SX310DA2 31-Inch Lateral Assembly with Center Pipe Replacement for Hayward S310S Pro Series Sand Filter from Amazon...but mine is a side mount, not a top mount. My question for you; is the center pipe removable? I cannot find the lateral assembly with the part I need which is SX310CD2FW* Thank you in advance if you can help me with any knowledge.
The lateral assembly for a top mount filter versus a side mount filter does not inner change. Here is the link for the folding umbrella lateral assembly.
hallmarkpoolsupplies.com/p-1612-sx242ma2-s310s-lateral.aspx
Thank you so much for that link, But I clicked on it and it says unavailable.
@@KJK_ATX I checked with the manufacture and the part is on back order, check back with us and we will be glad to help.
What are your thoughts about using pea gravel 1st about just above the lateral assemblies? Then put sand above the pea gravel level. I've even heard of a layer of fine small glass. Which can serve as an algae repellent.
If it is a small tank or residential, sand only will be fine. If it is a larger tank or commercial, you can use pea gravel then sand. However most people just use sand only, Sand is definitely going to filter better then gravel or glass because it is much finer.
@Hallmark Pool Supplies I been having what I thought to be sand or dirt at the bottom of my pool. when try to clean it out with water hose vaccum it dissipate or it goes straight through the net. So I use pools vaccum pump and filter it though the waste. I don't know what it is. I guess it's algae. once I vaccum it out of the pool through the waste it stays clear long as filter is off but when it's on the dirt/algae gets back into the pool. I tried back washing and rinsing before turning filter back on. I'm still having this issue. Any solutions?
You need to chemical treat for mustard algae, take a water sample to your local pool store and have it tested. After treatment, you definitely want to vacuum on waste to remove. If you vacuum in filter it will come back into the pool. When vacuuming in waste you will have to add water to the pool. Once you are done you may want to check or change the sand in the filter.
PCV pipe is stuck to the top part of the assembly. How do I take it out using a heat gun
Sometimes this happens, you will have to wiggle and turn the pipe out. Using a pair of channel locks can help. Before you put the pipe back in, lightly sand the end of the pipe and lubricate. This will make it easier to get off in the future. Thanks for watching.
How much sand is too much? I always see sand on my step under the return jet in the pool. I vacuum in the morning and by afternoon, I see gritty material on the step. If that coming from the return jet or could it be small pieces of concrete coming off the bottom of the feet as people enter?
It’s possible that this could be dead algae. Dead algae looks a lot like sand, it’s so fine when you vacuum the pool in the filter position it will go through the filter and back into the pool. If you vacuum this sediment to waste it should resolve your problem. When vacuuming to waste you will have to add water to the pool. If this was sand or dirt it would not come back unless you have a broken lateral in your filter. If this happens after vacuuming this to waste or it gets worse then you may have to check your filter. Thanks for watching.
If the centerpiece of the lateral support and the filter is the filter
I cant find the whole assembly to purchase. What do you suggest?
I carry laterals as well as the assemblies, what filter brand and model do you have?
Mine only dose this when I backwash. Laterals are good. Maybe a valve?
Your valve should be fine. If sand comes out in backwash this can happen if there is to much sand in the tank. It will self level, however if this continues or you get sand in the pool, then you would want to check your laterals. Thanks for watching.
Could there be Channeling in the sand ??? If so how do i correct that
Yes, but not if the sand is new. Channeling occurs when the sand gets old and dirty. When this happens you would change the sand, the sand is usually changed every 3 to 5 years, depending on the type of chemicals you use.
What about after you backwash and rinse it then turn it back to filter and it spits out sand ..?
Watch it for now and if you continue to see sand coming out of your return jet then you may need to check your laterals. If you have any questions feel free to contact me.
My sand filter shows about 10 psi after backwashing. When it gets to about 13-14 psi it needs to be backwashed again (low flow shuts off pool heater and vacuum doesn't work). This filter is about 25 years old and never had sand changed. Do you think this is the problem?
Yes, thanks for watching.
If you get sand in the center tube, will it eventually get flushed out?
Yes, thanks for watching.
What about the return water looks murky while vacuuming. It's an above ground pool. We have a ton of dead algae at the bottom of the pool. We think. It's too cold to get in and try to grab it to see if it's sand. We can't keep it clear. Nothing works.bought two laterals in one year because the company will not honor a warranty. Anyway I'm about ready to get rid of the pool.
For normal cleaning you would vacuum the pool in the filter position, when a pool gets really dirty or algae infested you would vacuum in the waste position. When vacuuming to waste you are bypassing the filter, however you will have to add water to the pool. Thanks for watching.
@@HallmarkPoolSupplies I think my husband vacuums to waste no matter what lol But I appreciate your response.
How do I know what size laterals to get I can’t read the label on the tank it’s faded so bad
You can measure the diameter of you tank, this will tell us what size you have. Let me know and I will be glad to help.
I replaced my lateral assembly, as well as the sand - it didn’t seem to solve my problem. I can vacuum the pool clean, and after running my filter for just a few hours I’ve got dark spots at the bottom of my pool again. Any suggestions?
If you are vacuuming a pool that was algae infested or you had mustard algae, but the pool is clear now then you would want to vacuum the sediment to waste. Vacuuming to waste will bypass the filter, however you will have to add water to the pool. Once this fine sediment is out of the pool then you will vacuum in the filter position for normal vacuuming and cleaning. Thanks for watching.
We accidentally pulled the lateral assembly out of the sand and water when trying to put it together. Do we need so start over or is it safe to push the lateral assembly back down to the bottom?
The lateral assembly needs to be at the bottom of the filter. In order to get the assembly in place you will have to remove the sand and start over. Thanks for watching.
@@HallmarkPoolSupplies I figured thanks for the response. Any tips on keeping it centered at the bottom when filling with sand?
On most filters there is a notch at the bottom of the filter to set the lateral assembly. Once in place, hold the lateral assembly down while pouring in the sand.
Mine doesn’t have legs on it
I have the Hayward pool and spa sand filter. They didn’t mark it when they put it up it either carries 100 pound of sand or 150 pounds of sand. How can I find out
If you measure the diameter of the tank this will help. 16 1/2” is 100 lbs, 18 1/2”is 150 lbs, 20 1/2 is 200 lbs, 22 1/2” is 250 lbs and 24 1/2 is 300 lbs. Thanks for watching.
Mark is this the outside diameter or inside ??
This is the outside diameter, thanks for watching.
Are u located in Florida
NC
I had a broken lateral. How do i now get the sand out of the pool.
Vacuum to waste, when you vacuum to waste you will have to add water to the pool. Thanks for watching.
How much sand should I have in my tank??
As a rule your tank should be about 2/3 full. You can also look at the label on the filter this will tell you how much sand you need. Thanks for watching.
Is it normal to have sand stuck in the slots of the laterals?
It can, just make sure that the slats are not broke and that sand can not pass through. If in question, then replace the lateral or laterals.
@Hallmark Pool Supplies I am getting sand in the bottom of my pool and it is getting in through the return. I placed a filter sock over the return and it is letting debry and sand through. I inspected the laterals and the pipe and nothing was cracked. But sand was stuck in the slots on the laterals and the bottom of the pipe has slots and some look wider than they should be. But that's they way it came new..it's an intex salt water system. Any thoughts or recommendations?
If you have an Intex system, contact the manufacturer and they should be able to help, especially if you need parts.
My lateral stem measure measures 21
A Hayward lateral assembly that measures 21" takes 150 lbs of sand.
What if sand is filtering in pool yet?
You are saying do but You are not actually showing getting the laterals outnof the tank
It is faster, cheaper and a smart decision to replace the sand filter entirely with a cartridge or DE filter. Problem solved, and superior filtration from these replacements. Save water and chemical costs too.
My lateral pipe breaks every year!!!
Sorry to hear, thanks for watching.
I have a Hayward model S244S. An older model I assume. I can’t seem to find an exact match for lateral replacement. Can you help?
I have the laterals for both the old style and new style S244S filter. Do your laterals fold up or are they threaded and screw in ? Let me know and I will be glad to help. Thanks for watching.
Thanks for your reply! I’m assuming it’s an older model. I called a pool company to change my sand and any broken laterals and they said parts were not longer available and would need to install a new filter 🤔
At this time, I’m not sure, but if I do have the screw in type, could I change to the fold up type?@@HallmarkPoolSupplies
Contact me during business hours, there are several options and l will be glad to help.
I replaced my lateral assembly, as well as the sand - it didn’t seem to solve my problem. I can vacuum the pool clean, and after running my filter for just a few hours I’ve got dark spots at the bottom of my pool again. Any suggestions?
If you are vacuuming a pool that was algae infested or you had mustard algae, but the pool is clear now then you would want to vacuum the sediment to waste. Vacuuming to waste will bypass the filter, however you will have to add water to the pool. Once this fine sediment is out of the pool then you will vacuum in the filter position for normal vacuuming and cleaning. Thanks for watching.
We have vacuumed to waste, as well as vacuumed with independent vacuums that aren’t attached to the filter. The sand (or potentially algae) always returns to the bottom of the pool after the filter has been running for a few hours. Is it possible the new lateral is broken? Or can the algae be returning when the filter is on? Thank you!
Fine sediment should be vacuumed to waste. Dead algae or mustard algae is so fine it will go through the filter back into the pool. Do not use an automatic cleaner because it will stir up the sediment and it will also run through the cleaner back into the pool. Once all this fine sediment is out of the pool you will be fine. I believe that your filter is good, if one of the laterals is broke then you would have a lot of sand at the bottom of each return jet in the pool. If this sediment is all over the floor of the pool it is dead algae and it looks like sand. Sand will only accumulate at the floor under the return jets of the pool, not the whole entire pool.