PH ProblemsThis is our first pool season and we are continually adding PH Minus. We are going through almost 20- 40lbs a month of PH Minus. Every few days we test our water with a swimline hydrotools test kit and the PH is always above 8. Everything else seems to be inline so we are not sure what to do. The PH Minus seems to bring it down to the right level but it doesn't last. Please advise. Thank you!