I have been pouring 1.5 gallons of 6% ultra bleach in the pool in the PM. for the past 3 days. My pool, 12000 gallons fiberglass, readings (wal-mart test kit) each AM prior to sun exposure are:

free cl 1.2
total cl 6
combined cl 4.8
pH 7.8
cya 0

The cl drops to 0 by the late afternoon each day.

I ran out of cya reagent after the initial test, but I'm thinking that the lack of stabilizer is my problem. I need the expert advice of the 'forum' before I put stabilizer in the pool. Where can I purchase some cya reagent? (charleston, SC) If zero stabilizer is the issue, hiow much do I add? Thanks