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Ok I'll get a TA kit, however let's just assume for a bit the numbers are correct, What's causing the scale then, not the high PH that occurs over the winter or something else about the water chemistry? (not enough/too much TA, not enough/too much calcium? ) The orenda calculator suggests...

I guess I don't totally understand. Pool math app shows TA should be between 50 - 90. It's 79. The test before that showed 100 TA and I've used about 6 bottles of MA this week. So I'm actually buying 79 as a decent result. (I will look into test kits as well though) So if low PH...

Saltwater pool 30,000 gallons elevated hottub approx 1500 gallons?? Built Spring 2019 (6th year) Mid dark plaster Basic problem: PH keeps rising even when water is not circulating. Did a test yesterday, PH around 5PM was 6.8. This morning at 5AM the PH was 7.2. The pump was not running...