I’m not sure. I know they didn’t add salt in like day 28 or something. I had to brush a couple times a day. But we didn’t have any issue until after we did the acid bath. It’s refilled and the calcium level are back within “normalish” range. I’m just working on getting the chemicals all balanced.I'm in this thread late but agree 100% with ajw22. Once you get your balance in check things will turn around. Do you have any idea what their pool care was in the first 30days after plaster was applied?