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Thanks guys, I'll keep in mind the bacteria and will raise the FC in the AM of those heavier use days.

I run my pool with a CYA of 30 and keep the FC around 3 or so. On a day like today with heavy swimmer load and lots of sun, I will check the pool at 8AM and it will have 3 FC but by 4PM it's down to 0 FC. If I load back up the clorine to 4 - 5 FC, what's the best guess of running into a...