Began having a problem with small patches of algae in a crystal clear pool. Vacuum every day but its back the next morning. Noticed very high chlorine usage after I had been adding a gallon of bleach a day. Tested CYA and black dot does not disappear at all. Drained and refilled about 12 inches of pool water twice but CYA reading is the same. Question is how in the world does CYA get so high when all I have been doing is adding bleach? We have had above average rain here in Central Florida and also my pool gets pine needles but I get them out quickly. Any help would be appreciated. I'm guessing I need to continue the drain and refill. How many times?
CYA Off the Charts !
- Thread starter Dave2590
- Start date
Have you used any other chemical product or puck like tablets in your pool? Are you testing the CYA outdoors, with the sun to your back while holding the tube at waist high level?
Can you provide a full set of test results, please?
Can you provide a full set of test results, please?
If the dot never disappears then you don't have any CYA. Which explains why your chlorine isn't lasting very long. Time to add some CYA.
What a dummy I am ! Good grief ! I was reading it the opposite way. Yes CYA is zero and I need to increase it not decrease it. I'll add one sockful of stabilizer and test again. Thanks. Sheesh !
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I have not used anything other than bleach and yes testing outdoors, back to the sun and around waist high level.
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I have not used anything other than bleach and yes testing outdoors, back to the sun and around waist high level.
- Jun 22, 2014
- 47,789
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Don't you worry. Each of us has a personal story like that.
Not the first one and will not be the last 
Do not bother testing for the CYA until about a week after adding it to the water. Treat your water as if your CYA is at your target amount.
Kim
Do not bother testing for the CYA until about a week after adding it to the water. Treat your water as if your CYA is at your target amount.
Kim
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