Go easy on me. Ijust discovered this forum this week and ordered my test kits on Wednesday. So cut some slack on the test strips!
As for my problem, I am thinking the aburpt pH change probably took the Ca out of solution.
I'm not convinced that I need to get my chlorine to 15 ppm. By OTO it's been at 2-3.
I just shocked with a gallon of liquid shock (12.5% Na hypochloride) before I drained the pool (Monday) and did it again after draining it on Tuesday.
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