The pool holds 22000 gallons, The cell is only about 2 years old (replaced from old one), it is a Supercell SC60. The readings I have are: pH:7.2, alkalinity: 80, stabilizer: 30-50, salt level: 3200. These are the only readings I have. We ARE fighting the black algae, which is not TOO bad right now, have added a product and are brushing everyday. I added 4 chlorine tabs yesterday and this AM still have no chlorine reading. (can it be eating up the chlorine that fast?)The water is starting to look discolored in the deep end. Another note- we live in a very rural area with the only pool service 70 miles away-- and they don't like to come here often. Last year it took them 4 months to come to do some service-- so we are kinda on our own.