Hello y'all, in TX waiting for my pool to get warm enough to swim in. This is the 2nd summer for my 12,000 gal pool. The pool school that the builders provided me with was very basic, and the first summer chlorine was all I needed to add. I only have the test strips to work with, but all 4 areas are reading high. The chlorine tabs are fed thru the pump and I have it set on low, so I don't know why that would be high. All the neighbor kids are asking to swim already, and I'm afraid they will get burned by the chemicals. Can anybody tell me where I should start?