Hi. My first post. I have a 22,000 gallon marcite pool, evaporation refill by alkaline well water. I have to add about a gallon of muriatic acid each week. But, I digress.
Since the pool was filled, 12 years ago, about 1,000 pounds of tri-chlor tablets have been dissolved in it. Leslie's tells me my CYA is 90 and my FC is 2 (which on their report states OK!) However, algae is sometimes a problem.
Recently I slammed the pool with 7 gallons of 10% Sodium Hypochlorite liquid. Looks great!
I read that (and calculated on poolcalculator.com) with my I need a FC level of about 7 to 12 in order to keep algae away. I also read that maintaining this FC level is impossible with tri-chlor tablets. Is this true?
Question: With a CYA level of 90, how can I maintain a FC level of 7 to 12 with tri-chlor tablets? If I can't, what are my options?
Draining and refilling the pool is not a financially viable option.
Using the Leslie's CYA lowering stuff sounds like a nightmare.