Hello- I need some help figuring out why my pool is not holding free chlorine. It is an indoor pool and is not being used. We just bought the place and I'm learning how to test and balance everything myself. Per advice from the good folks on this forum, I shocked the pool and kept it there (FC at 12, CYA30) for 30 hours (CC was at 0.5 or 0 the whole time). The CH was very low so we added about 25 pounds of Calcium Chloride on Saturday (from the pool store) to raise the level. On Sunday, the FC read 0.5 and CC was 0.5. I added enough 10% pure chlorine from the pool store to raise the FC to 5-6. I want to keep it at 5-6 since we aren't using it and I don't want to add chlorine every day. I wasn't home to test the water all day. Tested this morning, Monday, and the numbers didn't change at all. I searched the forum and everything says that adding Calcium shouldn't effect FC levels, however, that is the only thing that was done differently. I want to get this thing balanced and get the right amount of chlorine in it so I can put the cover back on and turn the heat off. This pool is costing us money to heat the room to keep condensation down and we aren't even using it! Please advise on how to get it to hold the FC. The water is crystal clear.
FC 1
CC 0.5
pH 7.4
TA 100
CH 270
CYA 30
FC 1
CC 0.5
pH 7.4
TA 100
CH 270
CYA 30