frustratedpoolmom said:Black Algae is round, small dots like the size of eraser and they spread out in a circular way, green algae is more suspended in the water but will also cling to surfaces. Mustard Algae is similar to green algae but it is more resistant to chlorine, and often it takes prolonged periods of higher FC and brushing to keep mustard algae at bay. Mustard Algae tends to like shady areas of the pool. Black algae is also resistant to chlorine, and it takes frequent brushing with an appropriate brush, with FC at shock level to kill it. It can leave behind nasty stains. It is very rare if not unheard of in a vinyl pool.
If you have stains in your pool and post them, we may be able to help identify them.
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.
What is an appropiate brush for black algae on vinyl?
Can black algae be my Chlor level problem?