Re: Black spots on bottom of pool??
PoolDoc, I read somewhere that sprinking trichlor granules/cal hypo directly on top of the black spots or scrubbing the black areas with trichlor pucks with a holder (while keeping a lower pH 7.0) might help? And keep the pump switched off for the day or so for the granules to work directly on the spots and srcubbing. Do you think it will help?
18x32 kidney 15K gal IG Gunite pool; skimmer tabs; Hayward DE6000 DE filter; Hayward/AO Smith Superflow 1 speed pump; 12 hrs; heat pump, fountain or waterfall; Taylor K2006C ; utility water; summer: none; winter: none; android tablet; PF:8