Hello, we have a 2500 gal indoor heated therapy pool that is normally very easy to balance chemically. However, recently we somehow have gotten the chlorine level above 10 total chlorine and 20 free chlorine. The pH is still too low (6.8), alkalinity is 180 (high) and CYA is way high. Normally we dump in about a bottle or two of hydrogen peroxide and that brings the chlorine down to manageable levels. However, right now, hydrogen peroxide is being price gouged (like $16/32 oz!!!). Is there any other way to reduce the chlorine other than emptying the pool and refilling? Maybe that would be the cheapest in the end? We can only empty about half of it for various reasons.
How to Decrease Chlorine in indoor therapy pool
- Thread starter dmclendineng
- Start date
Hang on..... Total Chlorine has to be equal to or greater than Free Chlorine.
Getting names confused is no big deal, but a discrepancy of 10 is. Do you mean you have 10 ppm Combined Chloramines? That pool has got to smell! Or has somebody been using non-chlorine "shock" aka Potassium Monopersulfate aka MPS? Because it reads as CC unless you get the correct test reagents.
Sodium Thiosulfate from the pool store can reduce FC. UV light will do it, too, and also break down CC. I don't know if thiosulfate works on CC.
Getting names confused is no big deal, but a discrepancy of 10 is. Do you mean you have 10 ppm Combined Chloramines? That pool has got to smell! Or has somebody been using non-chlorine "shock" aka Potassium Monopersulfate aka MPS? Because it reads as CC unless you get the correct test reagents.
Sodium Thiosulfate from the pool store can reduce FC. UV light will do it, too, and also break down CC. I don't know if thiosulfate works on CC.
DM,
Hi and welcome, How are you testing the water. We don't like test strips as they're unreliable. You're obviously using pucks as how else would the CYA be over the top or the guess strips you use are bad. Also with a TA of 180 you can't have a PH of 6.8. You need one of these to get you started. Also read pool school to better understand the chemistry.
Hi and welcome, How are you testing the water. We don't like test strips as they're unreliable. You're obviously using pucks as how else would the CYA be over the top or the guess strips you use are bad. Also with a TA of 180 you can't have a PH of 6.8. You need one of these to get you started. Also read pool school to better understand the chemistry.
Yes, we are using strips, and I got the same result with two different brands of strips side by side. I always have low pH and high alk. I don't know how that works or how to lower alk without also lowering pH. We were using the wrong kind of chlorine tabs, evidently had stabilizer in them. We are now draining as much water as we can, and I've bought a bucket of straight clorine without stabilizer to use from now on. I have no idea how the chlorine ended up that high. I only had one tab in the floatie thing, with the thing almost shut. We've had this pool for 5 years and have never had so much trouble balancing it as we have these last couple months. Maybe starting over with fresh water will help us. We'll get a regular rest kit again soon. We used to use one with our outdoor pool. It's hard to keep 88 degree water at the right balances I think.
- May 3, 2014
- 62,771
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40