I've been using BBB for the last 5 years. I'm in the Boston area, and after opening the pool this year I cannot maintain my FC levels. CC has been 0.2 or so. Now the pool is covered with an automatic cover, so sun is not the issue. Two nights ago I added bleach (enough to raise FC to 15 ppm) and a day later it is down to 7.5 or so.
Now I did check my CYA levels, and I could not get it to register so I will be raising that up, but since the pool gets no sun (it is always covered, as the kids haven't started to use it yet) I think that's not the issue. The water is crystal clear.
Ph is 7.2, TA 80, Calcium 220. Using a Taylor test kit. I'm thinking I need to maitain FC of 15 for a few days. Any other suggestions?