I had an algae problem about a week ago. I did not have a good test kit but do now. My CYA was at 0 and with some very sunny days followed by a a lot of rain the pool turned green. I have been shocking for 3-4 days and brushing several times a day. I did start with powder shock which I am using bleach now.
The overnight drop test did not use up any chlorine. So I am guessing everything is cleared up but the pool is still tinted green and clouded. From reading the forums it seems I need sequestrate added. Not sure what to buy or how much to add.
Or should I let the FC fall and raise the PH a little first?
1) 21000 Gallons
2) Cartridge (It's older was thinking of replacing it)
4) 1 1/2 HP
PH 7.2 (Before I shocked)