I have a fiberglass pool with a ph of 7.6 alkalinity of about 240. I know alkalinty is high but havent been able to get it much lower without lowering ph. Anyway I only use liquid chlorine as I have been told that using pucks can be problematic long term. The chlorine burns off very quickly and I keep having to add gallons ea h week to keep water clear. Purchased cya stabilizer from amazon and local great escape. I added one waited for 2 weeks nada. Bought from amazon with great reviews and added more than recommend and still does not register. I have a large sand filter which I made sure not to backwash for a week after adding cya. I have 3 test kits so that's not it. Please help,