DiyCam Posted January 4, 2022 Report Share Posted January 4, 2022 Hi friends, I have just taken over a 12000 gallon in ground plaster pool with terrible chemistry - here are my measurements via Taylor 2006. It's my first pool and I've been learning and haven't done much except raise the pH so far. I have a cartridge filter and solar heating, it's winter so nobody is using the pool and temp is about 53F. CYA (using 1:9 diluted sample) is 550 CH 1300. TA 150 pH 7.4 (I brought this up from 6.5 or below) FC 13 CC ~0 My fill water has about 100ppm CH I have green algae, and white scale around the tile line. I've already decided to do a complete simultaneous drain and refill using the plastic sheet method. My questions: If I were to deal with the algae before draining, it would require I think a shock level of at least 220ppm FC (40% of 550CYA) - is this correct and is it OK to go this high? What target levels should I aim for during the initial weeks after the refill? Is there a chemistry I can run that will safely reverse the scaling? I'm planning to chlorinate with bleach and manage CYA separately Thanks for any advice Quote Link to comment Share on other sites More sharing options...
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