Just completed a no-drain acid treatment on the pool to remove hydration stains. Now trying to balance pool. All going well except Calcium Hardness and Alkalinity. PH was 7.4 with Alk at 175, so I dropped PH to 7.0. Any idea how long it takes Alk to drop with PH at 7.0? Out of the faucet, CH is 250. Mine was at 500. After a couple of partial drains approximately 40% last Thursday and 30% on Friday, my CH is now at 425 and of course my local county water department is laughing all the way to the bank. The Pool Calc(Smart Phone Version) is telling me with a source of 250 and a goal of 300, I need to drain 71% of my water. After spending $$$ on start up products to balance pool, I really don't want to flush more money down the drain. Looking for insight on another approach to lower CH to 300. I went to pool store to purchase salt. I did the no-no and had them test the water. I have a Taylor K2006 so I wanted to compare. We were spot on with FC, CC, PH. They showed my CH at 440 when I tested 425 and Alk at 190 when I tested at 175. Interestingly enough, I was trying to get CYA to 70 and my kit showed 35. Theirs showed 60. That was a shocker.
Anyway, while talking to owner, she said she thought CH would go down as water temp came up. My water temp is currently at 64 deg.
As always, any help is appreciated.