Hi, new member. 16500 gal. white plaster inground pool.
FC 12 - 20
So. california area where we get a lot of sun. I am keeping my minimum FC level at or above 12 after battling mustard algea. The water is as clear as I've ever seen it and everything is stable but I'm using a lot of Chlorine. I buy it at Walmart (the 10% stuff). After a reading of 13 or 12.5, I will add to around 20 to bring it up. In just 2 days I'm already back to around 12 again. I read where the FC usage will or should fall to around 1ppm per 24hr period. Am I going to stay at 4ppm usage per day because of the CYA level or am I missing something?