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I ordered a new CYA test to get a more accurate reading and will report back as soon as I can. I don’t think I’ve ever used a yellow out product. I tried Oxysheen about 6 years ago but no problems since then. I’ve only been using liquid chlorine, stabilized chlorine tablets, and muriatic acid or...

Thanks for the reply Casey. Chlorine results are with my TF-100, but I lost my CYA bottle. That’s why the stabilizer result is from the test strip. Regardless, I’ve rarely lost 5ppm in a day, certainly not 20.

I’ve had this pool 8 years and haven’t had this problem since learning to shock properly. I shock my pool to 20ppm in the evening. No loss by the next morning, but all of the chlorine is gone when I get home again in the evening. Using a DPD/FAS test for chlorine. Stabilizer is 50 using Clorox...

Great! Thanks. I haven't added any CYA yet. Is it okay to wait until after I shock it? I assume 10ppm FC should be sufficient since that is the lowest in the CYA/FC chart. I just don't know how much chlorine to add each time. According to the bottle, 180oz. should be enough to raise the FC...

Thanks Dave. I haven't been able to get the FC to stay at shock level yet. I read a rule of thumb to shock by raising the FC to 10 times the amount of CC, which means I would have to get my FC up to 81ppm. I was worried this is bad for the pool, so the store recommended non-chlorine shock...

I found this online: CAUTION: Oxidizers other than chlorine (OxySheen and other products containing peroxymonopersulfate) will react with DPD #3. So evidently, it is interfering with my DPD test. Took a sample in to a different store this morning and my levels were still high - 1.9ppm FC and...

I just opened my 18,000 gallon pool and shocked with 4 gallons of liquid chlorine. FC was 1ppm and CC was 6ppm. Pool store said to add 18lbs of oxysheen. Now my FAS/DPD test is showing 14ppm FC. But my OTO test is still showing 1ppm. Does oxysheen cause the FAS/DPD test to show high FC...