I work For a resourt with a pool that has 273,000 gallons the pool company that took care of it before i was hired did not do their job at all i tested everything and it was all low! I am starting to get Everything back to Normal But i cant seem to keep chlorine in the pool. We use Trichlor 3 inch tablets i will add 30 tablets to the pool and come in the next morning and barely be able to see any color when the FC is tested. the pool is starting to grow black alage on the walls any help will be greatly appreciated !
As of right now my testing is.
FC..5 If I am Lucky