Hi I opened my pool Tuesday. My cya was 30 ph 7.2 pool calculator had me add 355oz of bleach. Today mt cya is less than 20 and my chlorine is zero. What happened? At the end of last summer my cya was 180. Help please. Do I need stabilizer?
I assume that is FC and CC? The FAS-DPD does not test for TC ... unless you added the FC and CC together.
Anyway, that is a lot of CC and this is a sign of possible ammonia in the water. As such, the FC is going to be consumed very quickly. Continue to dose up to 10ppm and retesting every 30-60 minutes. Once the CC drop and the FC starts to hold, then you can consider adding some more CYA and continuing the SLAM Process.