Pool water is now crystal clear thanks to you guys. Switched to BBB and it's looks great - except I have a vinyl liner which I believe has black algae. There are only about 5-10 spots smaller than a dime (eraser head) I have brushed scratched and rubbed with no luck. Now after a couple of days the bottom has black areas that I can easily brush but I concerned. I am having a hard time keeping Chlorine level up. CYA = 30. PH=7.5 Chlor= 3.5 to 6 but drops to near zero in less than 2 days. I burning through 8-12 gallons of bleach every other day. The pool store sold me a 32ounce bottle of algaecide (Bioguard) and they believe it is black algae. But it has not gone away. I'm using a nylon brush vacuum head.Originally Posted by frustratedpoolmom
What is an appropiate brush for black algae on vinyl?
Can black algae be my Chlor level problem?