I'm new to the website and am posting my first question. I have an above-ground pool that's 18' x 48". The water just turned green, so I am planning to shock it. When I read the informative thread about shocking a pool, it recommended that I first establish my CYA levels to determine amount of chlorine needed to shock.
So, I added the recommended amount of booster to get my CYA to 70. I ran the pump, waited a day, then retested my CYA. It's still around 30. I just now read that it may take up to a week for the solid CYA booster to take effect. My question is this: do I need to wait a week, re-test my CYA, then begin shocking the pool if the CYA is sufficiently high, or can I just start shocking the pool now, even though my CYA seems too low? Any advice would be appreciated!