Our pool was just cleaned by the PB this week and we were given clearance to get in and swim. I noticed quickly as the water started to clear from the dirt that he stirred up that there was a white line around the pool. After reading a bunch, I'm assuming this is calcium buildup from the concrete (since it is so alkaline) that sat in our pool for days before it was cleaned and water was balanced, as the ph was through the roof and we added quite a bit of acid to get it lowered back down. (chlorine and ph were in check before concrete happened as I checked levels everyday to make sure we didn't get algae)
I've tried scrubbing with a stiff nylon bristle brush and was able to get SOME of it off, but I'm pretty sure the whole area below the water line is covered in it, as when I run my hand down the side of the pool it is smooth until I hit the water line and then it is rough. What is safe to use on fiberglass pools besides nylon brushes?
CH tested at 450. PB trucked water in and I don't know what the CH of that water was. I know it's recommended to remove and add new water with low CH but how can I get what's already formed in there removed? I've read about things like Caltreat and Beautec scale remover. Has anyone here used these and had any success? I would like to try to get this removed before we close it for winter and it gets worse. It's only been 4 days and I feel like our brand new pool is ruined already!
Any suggestions? If you need more info. let me know, I was trying not to ramble...