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thanks for the help, no trees around pool closest ones are 75 ft away. on the cya it is around 65-70. ph usually stays around 7.2- 7.5. i use the t-100 test kit. I think that is what it is called it is the kits that everyone here recommends. it does want to start in the corners that seems to...

ATTACH] I am having issue that i slam pool , do the check overnight test and show no loss of fc over 1 ppm, and then allow pool to come back down to 5-7 cl. then if no one swims in pool for four or five days i get some surface algae in the corners and some on side walls. What am i missing.