I live in Alabama. The pool has been clear all winter. The last few weeks we have been warm and the pool is now green. I want to slam with 10% pool bleach from Walmart. I just tested the CYA and the dot never disappeared. So I'm guessing I have 0 or very little CYA left. Do I need to raise CYA or just slam with bleach until I get the water clear. PH is 7.2. CL is .5. Then raise my CYA to 70-80