I have sun all day so I don't retain much chlorine. I was 'pool-stored' with the phosphate thing last year too. The only money I spend now is on bleach. I may use more than average because of all day sun. I measure my Cl & pH every night with the PS200 and do a full run of test once a week. Our water is great. I try to keep my Cl to recommended high end.

Just follow the guidelines on this site and it'll work.