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I did the FAS-DPD Test twice this morning. According to it, my FC was 18.4. This is not possible. My TC level was 0 according to an OTO Test, Test Strips, and the AquaChem TruTest Reader last night, and I added 3 gallons of 8.25% bleach which should have brought the chlorine level up to 16 ppm...

As best I can tell, I have the Pentair SD40 Sand Filter, which is a 19" filter. I have had major equipment related issues this summer, all of which are ultimately my fault for relying on the local pool company to take care of them. I'm not going to go into detail of why I asked them to handle it...

I've been battling algae for some time (three weeks). The pool was merely cloudy upon opening. I shocked, and upon the pool clearing, I maintained an FC level of between 3-4 ppm. The problems started after a week straight of heavy wind and rain. I've confirmed that the pH, alkalinity, and FC...