Okay, im at my wits end with this black algae in my pool. I have kept the pool at shock level or very close by for a week now. (there are some times it slipped below recommended shock level but not for more than a couple of hours) Anyways my black algae has developed a force field. I have been brushing rigourously for a week now with a metal brush, but it wasn't doing jack. The outer layer of algae has turned gray and calcified of sorts. A metal brush does nothing to this outer shield. After a week, I finally got tired of brushing and moved up the arsenal to a pumice stone. The stone seems to be able to break up that outer layer and expose fresh dark green algae, but it is certainly a workout. Is there an easier way? Or do I continue on with the pumice stone and just curse my bad luck? Im currently adding about 2 gallons of 10% clorine a day to keep it at that FC level. The pool is crystal clear except for were these black algae spots are. I do confess that the black algae has been growing for about 6 months now, and Im finally trying to nuke it.
FC is 25 right now
CC is .5
CYA is 40
ph is 7.5
FC is 25 right now
CC is .5
CYA is 40
ph is 7.5