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Would that mean that 2 or 3 ppm FC loss overnight might suggest that there is still algae present? I'll bring it down to 9+ and watch the fall off for a while. That's the only one of the three conditions I haven't met yet. Thank you for your help.

Thanks for answering. So, I would be better off checking it every day and keeping the FC level as close to 9 as I can without falling below that number? I was kinda trying to give my self a day off (so to speak) Thats why I would build it up to 20 or so. Oh, the 12% is the Mustard Algae Minimum...

Hi, new member. 16500 gal. white plaster inground pool. FC 12 - 20 pH 7.8 T/A 90 CH 220 CYA 75 So. california area where we get a lot of sun. I am keeping my minimum FC level at or above 12 after battling mustard algea. The water is as clear as I've ever seen it and everything is stable but...