The Pros and Cons of UV and Ozone Systems with Chemistry Expert Bob Lowry
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- Опубликовано: 11 июл 2024
- Have you ever wondered If a UV System or Ozone System are effective ways to use less chlorine and save money? With everything, there are of course pros and cons, and UV, Ozone, and AOP systems are all the rage in the industry. So what does a chemistry expert like Bob Lowry think about these systems?
Bob Lowry is the author of over 23 books but this has to be one of his most relevant and shortest books coming in at just 19 pages thick. But it is packed with so many essentials on residential pool chemistry that you will want a copy to carry in your service truck. Bob Lowry has been in the industry for over 47 years and is the Lead Consultant at Lowry Consulting Group, leads the Pool Chemistry Training Institute, and has created the Certified Residential Pool & Spa Certification Program. Learn more at pcti.online/
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Here is an excerpt from one of Bob Lowry’s Tech bulletins on AOP vs UV & Ozone. You can of course read the entire article on his site with this link.
poolchemistrytraininginstitut...
AOP (Advanced Oxidation Process) and OH (Hydroxyl Radicals) by Robert Lowry
Comparing AOP with Ozone and UV:
There is no question that AOP is the most powerful oxidizer that can be added to pool or spa water. UV is great at destroying viruses, bacteria, and other pathogens like Cryptosporidium parvum and Giardia lamblia, and E. coli. UV does not add anything to the water so there is no chemical change. However, UV is stationary and only contaminated water that passes through the UV light chamber is exposed to the UV rays. UV destroys chloramines and combined chlorine but does not do much against organics, organic pollutants, taste, odor, metals, biofilm or algae, or anything that is growing in or attached to the vessel or plumbing.
According to Ernest R. (Chip) Blatchley “sometimes some organics with broken bonds are radicals that combine to form even worse compounds like cyanogen chloride.” And, of course, UV does not provide a residual in the water. UV may partially affect an organism and that organism may regrow or mutate.
Ozone is very good at destroying viruses, bacteria, taste and odor, chloramines, and combined chlorine and most organic matter although it reacts slowly with ammonia. As you can see in the graphic, ozone does not cover all of the oxidizable things that can be in the water. Ozone has a short half-life in pool water from a few seconds for heavily contaminated water to a few minutes for water with not much oxidizer demand or with some amount of free chlorine in the water. It also does not provide a lasting residual and does nothing for biofilm, algae, or other contaminants in the plumbing or on the pool walls or bottom.
AOP covers almost all the possibilities of oxidizable things in the water and is an excellent disinfectant as you can see in the graphs to the right. However •OH is the shortest-lived oxidizer with less than 1 second in water. Therefore it is very unlikely that it could ever be used as a stand-alone disinfectant and oxidizer and chlorine would be the best choice to use with it. Granted that you could probably reduce chlorine consumption by up to 90% if the AOP is sized properly.
Chlorine Elimination
Right upfront, I do not believe that you will be able to eliminate chlorine completely by using any AOP device to make •OH. The most obvious reason is that UV, ozone, and •OH while they are very powerful oxidizers and disinfectants, do not build up in the water, they do not create a residual, and they don’t protect against future contamination or react to increased demand. They produce a fixed amount of •OH which might be enough for some amount of contamination for bathers but put 10 people in a spa or have 20 kids jump in the backyard pool and the AOP device can’t handle the increase.
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Bob Lowry is THE man in the pool industry!!
Greatly missed by thousands of pool people
New pool business owner in North Dakota here. Been working in the industry about 3 years and I love it. The stressors of a new business sure are setting in but I love the podcast and I'm constantly learning
I have a ozone unit on my pool built in summer of 2018. I love the ozone unit I can run my chlorine lower and I have never had an issue with combined chlorine or alga.
Thanks for the great feedback on Ozone. 👍
Great video
This was great info. I had the thinking that UV will handle most stuff and run lower chlorine. But now after this I really don't think I need a uv system, I was just about to order one next week. Saved me some money. Thanks.
Salt chlorination is good though
@@jgl4494 I have a salt chlorinator and an co2 injector. First time using both starting mid last month. Still dialing in, need it to warm up little more.
Glad the information was helpful!
Honestly, salt chlorinator is good, but it's VERY CORROSIVE TO METAL. if you have some metal frame around the pool, the metal becomes to rust
Good stuff
Thank you for all the info.. and greetings from denmark.
you guys talk about the swimmer to swimmer shield and therefore a need for "chemicals"
I have a diy cold plunge with a filter, uv and ozone..
im the only one who use the plunge so no swimmer to swimmer contamination..
Would you still recoment a form of chemeical disinfection or would it be enough sanitation with the current setup ?
Would like at least 1 ppm of chlorine.
So did i waste my money last night ordering an intex qz1100 chlorination unit with ozone for my 22'x54" 10,880 gallon above ground with 2800gph sand pump? Pool and equipment will be here next week. It was $340 vs 180 without the ozone function
I live in the south bay and looking to add the bioshield to my salt system. Any recommendations on a company to handle the install?
No one that I know of off hand.
Thank you!! Do you happen to have a video on how to change out the UV bulb? My light has gone out…
Each UV system is different but most have the PDF manual online.
just setting up interior inground 15 k gal , my intention is to put in a chemical inline feeder (Hayward 9 LB In Line Chemical Feeder ) can i put salt in this ? , a Del Ozone Next-Gen AOP 25 Ozone and UV-C System , rather than having a separate ( Pura Vida UV 2 Inground Pool Water Sterilizer Systemplus ) or (DEL UV-C 50 Ultraviolet Sanitizer System) and Clearblue Ionizer System, intention is to lower salt/ clorine use. Is this the ultimate setup ?
Look into the Chlorine Genie. I just got a unit and am impressed. All of the salt is contained in the unit and not in the pool and it can also regulate pH.
@@SPL Sounds excellant ! Where can i get this unit, i'm in Quebec, Canada
whats it cost ?
so now real question is use or not to use AOP ? you say it's most powerful oxidizer but same time you're saying there is no way to check if it is working. so do you recommend it or no?
Yes - that is the only real drawback. I would say not a big deal as it will be working unless there is a problem with the unit.
Would an ionizer and ozone with an in-line chlorinator be a good setup?
Yes. It will allow you to use less chlorine.
Have you(if not could you) do a video discussing Baquacil with a pool. I grew up using Baquacil and i prefer it hand over fist when comparing it to chlorine, salt, uv, or ozone. It's easier and just over all, in my opinion better. But commercial pools are required to use chlorine. All the people i know who say they hate Baquacil. I have learned it's because the price, bc someone told them too, or they se it wrong. Which also, in my opinion. If you do it correctly. It's easier and cheaper than using chlorine.
Yes - a great topic idea. 👍
isn't 2 ppm chlorine a recommended level in standard chlorine pools? If so, then how is UV and Ozone lowering chlorine levels needed in pool when Bob says you should have 2 ppm in pool with Ozone and UV?
The standard varies from pool to pool.
Is there an example of a floating free radical generator like he describes?
Not sure but there could be something like that. It is feasible.
When you use it uvc ozon lamp in room 30min how long you wait to enter room and open windows, how long you keep open windows ventilation?
I wouldn't know as all the UV systems I am familiar with are in pools. Sounds like a cool device though!
10:17 Mr. Lowry says something that hard to hear exactly the term he is saying. How does Ozone "kill"? "ozone kills by cell -?" Sounds like he says Cell Licing or Splicing, but I looked up both those and don't think that is what he says.
I think he said splicing
“Lysis refers to the breaking down of the membrane of a cell, often by viral, enzymic, or osmotic mechanisms that compromise its integrity.” I think he said Lysing
@@robgruhl3439 Yep. Definitely referring to cell lysis. He said “lysing”. It breaks down cell walls and cell membranes which spills out the guts and kills the organism
Ozone is O3, made by taking oxygen (O2) and charging it such that a 3rd oxygen bonds in an unstable way. Then as the ozone bumps around, it will react the spare oxygen with whatever it bumps into, essentially "burning" it. We breathe oxygen as the stable pairs, we do not want to breathe ozone.
If you remove all Cl from pool it isn't a supplement anymore... It is the primary.
Even with the addition of both ozone and UV you still need some chlorine. They are all 3 working as sanitizers - really irrelevant what you label as primary, secondary or supplemental. It’s pretty clear he’s just trying to convey you can rely on UV and ozone alone
The bulbs do not last more than 14 months (for us 3 seasons) and they cost over 500.00 Canadian, I am not convinced, just poorer.
Ouch! Me either.
Wanted to learn...fell asleep
Good night.
@@SPL ha! Great response 👍 you might be boringAF, but yall got a sense of humor!