How much of a difference will running an Ozone generator along with my SWG?

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F35GUY

Member
Oct 17, 2024
13
Toronto
Hello Everyone!

I am looking to upgrade my pool from traditional chlorine to using and SWG. I wanted more opinions on how much of a difference running and Ozone generator(producing 215mg an hour) will make. I have a 22000 gallon outdoor pool that is covered overnight and the VSP runs 24/7. The SWG we are seriously considering is the Aquarite 940 along with the DEL Ozone 25. If I could also get some info on how pool maintenance and chemistry would differ if running an ozone generator along side the SWG.

Current equipment specs:
Pumps:
Hayward super pump VS (Pool) THP: 0.85
Hayward Superpump (Spa) THP: 2

Filter: Hayward Sand filter(23inch)

Heater: Hayward's natural gas 250000 BTU

Note: Spa and pool pump are on the same plumbing line and in order to use spa we have to switch valves to only spa.
 
What is the reason for the Ozone device ? When the pool is properly sanitized with residual chlorine, already sanitary water passes through the device making it and expensive redundancy in an outdoor residential pool.

They serve a purpose in commercial pools with insane bather loads and strict limitations on CYA and FC in many jurisdictios, but those are also very large systems with an appropriate cost. The residential units can't come close to the same effectiveness.

And Welcome to TFP!!!
 
So, let’s put some numbers to your situation.

Ozone reacts with chlorine on a molar basis of 1:1 - that is, one mole of ozone will react with one mole of chlorine and the two will neutralize one another. The reactions are very complicated and there are different reaction mechanisms but, in general, 1 mole of ozone will destroy one mole of chlorine.

Your ozone system puts out 215mg/hr. Your SWG creates about [edit]28gm/hr[end-edit]. 215mg of ozone could, theoretically, consume 159mg of chlorine. So if the ozone were to react fully with chlorine, your SWG would not be able to keep up with the ozone generator.

[EDIT-COMMENT]

My typing dyslexia got the better of me. The SWG certainly produces more than enough chlorine gas to keep up with the ozone depletion. That's what I get for typing while .... sitting on the throne :poop: :ROFLMAO: ...

[END-EDIT]

Now there are lots of assumption in the above with the biggest one being that all of the ozone reacts with all of the chlorine. It won’t. Part of the reason is that, while chlorine is highly soluble in water, ozone has almost no solubility. So only tiny fraction of the ozone dissolves in water and some of it will react with “stuff” other than chlorine. But, in general, ozone will create a chlorine demand. A covered pool will outgas less Ozone than an uncovered pool and so you’ll have more chlorine loss from ozone.

In general, ozone is absolutely unnecessary in an outdoor residential swimming pool. Most people that have ozone systems realize that they cost more to maintain than they payback in any real sanitation.
 
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I would like to thank you guys for your quick responses and warm welcomes. Definitely going to dive a lot deeper with this new information and come to a conclusion. I will make sure to submit any of my questions here as its such a nice community.
 
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F35GUY said:
Current equipment specs:
Pumps:
Hayward super pump VS (Pool) THP: 0.85
Click to expand...
I cannot find the pump curve on this pump, I'd assume this is a low/medium head pump. I would get the largest VSP you can afford. A larger motor will move the same amount of water at a lower RPM...this will save in electrical costs.
F35GUY said:
Hayward Superpump (Spa) THP: 2
Click to expand...
Do you have the model number on this pump?
F35GUY said:
Filter: Hayward Sand filter(23inch)
Click to expand...
Get the largest filter you can afford. You might also consider a cartridge filter.
www.troublefreepool.com

Pool Filter Comparison

Your pool's filter is a vital part of your equipment pad. We'll take a look at each type of filter and list the pro's and con's of each.
www.troublefreepool.com www.troublefreepool.com
F35GUY said:
Heater: Hayward's natural gas 250000 BTU
Click to expand...
Again, get the largest heater you can afford. A larger heater will use the same amount of gas to heat the same, but will take less time. Only consideration is a larger heater may require a new gas meter to handle the flow requirements.
 
Also keep in mind, we have nothing to gain or lose by you purchasing an Ozone system.

Your pool builder/store/equipment manufacturers have their paychecks in mind and you likely will not get unbiased information from them. My pool builder was pushing the AOP system over SWG and I'm really glad I listened to the people here over my pool builder.
 
 

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Ozone primarily reduces chlorine to chloride (77%).

There are two different reactions of ozone with hypochlorite ions.

O3 + OCl- --> 2O2 + Cl-

ozone + hypochlorite --> oxygen + chloride ion (77%)

2 O3 + OCl- --> 2O2 + ClO3-

ozone + hypochlorite --> oxygen + chlorate (23%).

Ozone reacts slowly with hypochlorite ion, producing 77% chloride ion and 23% chlorate ion.

The rate of reaction decreases with decreasing pH (as the more stable-to-ozonation HOCI is formed from hypochlorite ion).

Therefore, applying ozone to drinking water containing free hypochlorite ion destroys both, decreasing the efficiency of both reagents.

 
6 grams per day ozone = 0.125 mole.

658 grams per day chlorine gas = 9.28 moles.

0.125 mole of ozone will remove about 0.101 mole of chlorine gas.

The ozone will destroy about 1.1% of the chlorine produced.

Other than destroying chlorine and producing chlorate, ozone is particularly good at oxidizing iron and copper, which will end up as stains.

So, basically, the Ozone is worthless and counterproductive.
 
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I have never had this much transparency and help about what ozone actually does. I have never really gotten a clear answer. I would like to thank you guys again for your amazing help and quick responses. I have opted out of doing an ozone system and going to stick with the Aquarite 940. Also going to consider upgrading the VSP. Thanks again
 
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