When my hubby was taking care of the pool using the pool store, I would notice it would turn greenish after the kids had been in it. Once I found Pool School, I shocked it, and it began looking a good bit better. Not crystal clear, but very clear in the shallow end and just slightly cloudy in the deep. The kids swam today, and it turned greenish afterwards again. Didn't do an FC loss test last night, but did two in a row earlier in the week, and the water passed. The loss was one the second time. Does this mean I may have algae again? Also, I have kept my chlorine levels up above 10 because my CYA is 80-100. But I took the water to a couple of different pool stores when buying some muriatic acid, and their chlorine tests showed 4 and 6, when mine was showing 10.5. Could my test be wrong and theirs right, in which case the chlorine is too low for my CYA level? I'm doing the test as directed.
CYA 80(my reading)-100 (both pool stores)