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TF-100 test kit. I raised CH to 250. I just don't know what happened to the calcium that was in there. I still had black algae hiding in the pool (found it in the grout between tiles) so I slammed again with no cc left. This algae is really persistent though. I'll raise CYA to 50 once I am...

Ok, longtime pool owner, but was on a SWG system which is so user friendly it's ridiculous. Now I'm on an older DE and FC system and after fighting off black algae last month I thought I had the chemistry fairly well controlled. I have borates (around 30) and CYA (also around 30) in there too...

Thanks for that feedback, I'm not as worried about color as structural integrity. The builder thinks he can match the grey fairly easily anyway. Now I'm off to dump seven sacks of salt into this bad boy and try to keep the kids out till it gets warmer.

I'm not second guessing it, I'm asking if anyone has seen this issue or the proposed fix. I have asked him for an extended warranty on the plaster given the issue though - because I'm concerned there could be spalling at these holes. As for standing behind the work, I certainly hope he does...

I've been reading on and off here while we've been building our inground pool in Austin, and so far have been pretty satisfied with our pool builder. I do however have a question about the plaster, which has been in for about 3 weeks. By the drains at the deepest part of the pool, we have five...