I'm just wondering if it's possible for a solar cover to lower pH. I ask because my pH always drifts up due to my SWG and slightly high TA (currently 130), but for the past 2 weeks I've had my solar cover on because it's been a bit cooler, and I have not needed to add any acid since I put the cover on. I usually have to add acid 1 or 2 times per week. But since I put the solar cover on, my pH has actually been decreasing very slowly. Does the cover somehow lower pH? I'm not concerned at all. I don't think this is anything to worry about. I'll just add some borax if it continues to drop. I'm just curious.