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Hi! I have a 34K gallon white plaster inground pool. In the past 2 weeks, my pH dropped from a consistent 7.6 to 7.2, and my chlorine level from 3 to .5-1.0. I have an off-line chlorinator, which is now open to 7, and a DE filtration system. I had an algae problem (green/brown on walls only)3...