Hi, first of all I would like to say thank you again to the moderators on this forum. I have been able to maintain clear pool water with no signs of algea by testing the water daily (FC, CC and pH) and following Ben's Best Guess Guidelines. Our pool was installed late last fall so this is my first time running the pool for a full swim season. We opened the pool in March with a CYA of 60. The first of June I noted the FC to drop faster over the day than it had in the past so I checked the CYA. It had dropped to approx 45. I added 1 lb of stabilizer and restested in 5 days to find CYA at around 50. Before I add more stabilizer I wanted to make sure a loss of CYA is "normal" and that it is not due to some sort of problem I should deal with first. I use the recommended test kit and have never had more than 0.5 CC.

I've also noted that I hardly have to use muriatic acid if I aerate the pool with the bubblers for about 2 hours per day!

Thanks in advance!