5 Steps to Remove Black Algae from Pool Plaster

Scrub with a stiff brush Use a nylon or stainless steel brush every few days to break up the algae’s protective biofilm before it hardens.

Keep chlorine and pH in range Maintain proper water chemistry so chlorine can work effectively against the algae.

Shock and scrub repeatedly if algae takes hold Once established, black algae requires multiple rounds of heavy shocking and scrubbing to eliminate.

Use phosphate remover as a secondary tool Only add phosphate remover if phosphate levels are high; it is not a primary solution.

Brush regularly to prevent recurrence Prevention is easier than cure—consistent brushing stops algae from establishing in the first place.