I have been slamming my pool trying to get rid of algae but it does not seem affected by it. I still have blackish greyish blue sand looking particles that keep coming back in clusters every couple hrs. I add more bleach to raise the fc levels to shock level. I have been scrubbing once a day. When I sweep a grey cloud comes up. The pool water looks crystal clear and not cloudy. The sand is always there. I am going to perform the oclt tonight but wanted input on whether I was dealing with black algae. I was waiting for this algae to clear up so I could shock it for the mustard algae. Should I change tactics and try and get the mustard algae first? We got the pool last year in a mess and slamming worked great to clear it up but it was very cloudy during the process so I think that is part of my confusion.
ph is 7.4 CYA is 40 Fc is 17 CC is 0 right now. It's a 22,000 vinyl pool.