CO2 vs Muriatic Acid

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
Pool Gec

CO2 vs Muriatic Acid

Postby Pool Gec » Mon 08 Jan, 2018 12:04

CO2 vs. Muriatic Acid : Question Assuming a balanced pool, how much CO2 would be used to manage pH verses the same pool using muriatic acid


Teapot
Swimming Pool Superstar
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My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: CO2 vs Muriatic Acid

Postby Teapot » Mon 08 Jan, 2018 12:52

Impossible to answer, depends on temperature, bather load, alkalinity of water supply and how many splashing swimmers/children in the pool. Only thing I can say is unless you have access to a low/no cost source of C02 it's going to be expensive possibly x2
Pool Gec

Re: CO2 vs Muriatic Acid

Postby Pool Gec » Thu 11 Jan, 2018 13:36

Teapot,

I understand that changing variable don't allow an accurate measurement of how much acid vs CO2 would you use on a specific pool. What I am asking is the cost relationship between the two options. I take it from your comment that you believe that acid is cheaper to use vs. CO2. What cost of acid do you base your projection of increased cost of x 2? Do you have any experience using CO2 vs Acid in a commercial pool setting?

Is there anyone on this blog that has some real experience with CO2? Is so please respond.
Teapot
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 437
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: CO2 vs Muriatic Acid

Postby Teapot » Thu 11 Jan, 2018 15:40

To be fair Pool Gec, there is a lot depending on it. The only pool I have worked on that used CO2 was a small hotel. Being small they didn't buy in bulk so were paying more for everything. don't forget the cost of delivery and servicing of the gas equipment compared to a peristaltic pipe change.

There is a lot dependent on the water in the pool and the top up water as to how much you'll use but CO2 is a weak acid and at pool pH a fair amount of the CO2 will be adding to the carbonates in the water increasing the alkalinity further and creating a bigger pH buffer. So you'll most likely use more as muratic acid to fight that as muratic lowers alkalinity as well it's difficult to compare, Many pools can benefit from a lower alkalinity (slows the pH rise) and a small compensation by increasing the pH (pH produces the biggest change in LSI)
If you could obtain costs for each muratic and CO2 and some idea of the water chemistry we'd be in a better place to judge.

On a commercial pool with commercial sized storage the difference maybe smaller say 1.25-1.5x more with CO2. I would be interested to know the answer on this as well bearing in mind different country and several years ago.

Sorry I haven't written that very clearly, if you haven't understood I'll try again.

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