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I lost 1ppm of FC overnight (12 hours). It rained throughout the night, so I'm not sure if I should count this test as valid. I'll do another test tonight, and hopefully, the rain will stop before then.

The pool water is crystal clear, and it was clear before and after the ascorbic acid treatment. Because my CC is 0 and the pool is clear, I wasn't sure if the AA was still consuming the FC. I'll do another overnight chlorine test, and if it fails, I'll start a SLAM tomorrow. I was really...

Can anyone provide any details on how long (or how much chlorine) it takes to re-balance the FC after doing an ascorbic acid treatment? I have a 23K gallon vinyl pool, and I may have gone a little heavy on the AA and use about 3.5 pounds to remove iron stains on the liner (panicked and added...