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I have done some more serious reading about CYA and its effects and was surprised by the findings. CYA basically trades chlorine power with chlorine longevity. Trying to better understand the tradeoffs I have been looking for numerical test results. I have found the following, as can be seen in...

I have an SWG and an outdoor pool with full sun along the whole day, usual temperture range is in the 90's The recommended CYA level in the SWG manual is 40 ppm. I read here that the recommended level is 70 ppm. Can someone shed some more light on this topic? Thanks, Avi.

Hi, I have a SWG unit but have been running my pool without it using bleach and had no problem. I wanted to start using the SWG so I have added salt to a level of 3000 ppm. I have also added CYA to raise its level from 30 ppm to 40 ppm, but this one is not dissolved yet. After few hours I have...

I had many people in the pool today. I knew it is going to be an overload so I have increased the SWG cycle. FC didn't fall below 6 all day. At the end of the day my CC was 1 and I probably need to shock the pool again. TA=90, CH=250, pH=7.5, CYA=35. What should I do in order to avoid rising...

Hi, My TA keeps creeping up. I had it down to 125 and it is 175 again. Initial TA was about 300 and it took me about a week and a lot of MA to get to 125. Any thoughts? Thanks, Avi.

I'm running low on pH indicator. Till I get a new one I thought about using a smaller water smaple with fewer drops. The standard volume is 44cc with 5 drops. Running at 40% will be 17.6cc with 2 drops. I assume that my measuring error will be bigger, just don't know how much. I can measure the...

Can I cover the pool during shock time to minimize chlorine lost? I think I have read somewhere that it should be ventilated, not sure tough.

I need to shock my pool since combined chlorine level is too high. I have been adviced to replace the water and not shock the pool since at high levels chlorine might attack the pool material and damage it. I own an Intex above the gound metal frame pool and my shock level is 13ppm. Is this a...