I've moved to a house with a pool that wasn't well maintained. The owner used chlorine tabs for years without ever draining the pool, so the CYA is through the roof. My testing kit only goes to 100 so I'm guessing it's at least 150, if not higher. Additionally, the PH is typically low (7.0 to 7.2) and the alkalinity is high (180 to 200--the fill water tests at 210). The high CYA or combination of other factors appears to have created a chlorine lock. I can put chlorine in the pool one day with a reading of approximately 5 ppm and within a day or two it's below 1 ppm.
I know the best thing to do would be to drain a good portion of the pool to lower CYA, but I live in Southern California and, as usual, we are in a drought year. I'm planning on doing that next year when I have the pool replastered and retiled. Without many options available, I opted to try the Bio-Active CYA Reducer. I've heard mixed results, but didn't feel I had many options.
I tried to get my chemistry within their prescribed ranges, but my alkalinity remains very high, despite adding multiple drops of muriatic acid. I've used Borax to help keep up PH. It had been up to 7.6, but is down to 7.2 after an acid drop today. I've tried aeration in the past, but I didn't see much success.
Any suggestions?
I know the best thing to do would be to drain a good portion of the pool to lower CYA, but I live in Southern California and, as usual, we are in a drought year. I'm planning on doing that next year when I have the pool replastered and retiled. Without many options available, I opted to try the Bio-Active CYA Reducer. I've heard mixed results, but didn't feel I had many options.
I tried to get my chemistry within their prescribed ranges, but my alkalinity remains very high, despite adding multiple drops of muriatic acid. I've used Borax to help keep up PH. It had been up to 7.6, but is down to 7.2 after an acid drop today. I've tried aeration in the past, but I didn't see much success.
Any suggestions?