I am needing help on just how to add my CYA to the pool and if I can add chlorine at this time? Should I wait on the chlorine until my CYA level is proper? The last owner told me he put it in a sock and put it at the bottom of the spa buy the main drain and let it dissolve this way. Is this a method that would work? I would guess yes. My CYA is at 0 since I have had to drain and clean this nasty pool. Here are my readings as of this morning. What would be my first step? As far as chlorine goes I have Super 3" tablets "HTH brand" and I have cal-hypo 65% "All-Clear chlor-right granules". The stabilizer I have is the HTH brand as well from Wal-Mart.