5 Steps to Fix Pink Pool Water (It’s Bacteria, Not Algae)

Shock the pool to 10–15 ppm free chlorine Super-chlorinate immediately. Pink slime is bacteria, not algae, and requires high chlorine levels to kill it.

Brush every pool surface Scrub walls, floor, and steps to break up the biofilm. Bacteria hides in slime layers that brushing disrupts.

Run the pump continuously for 24 hours Keep water moving to prevent stagnant spots where bacteria thrive. Low circulation is a primary cause.

Test and adjust pH to 7.2–7.4 High pH reduces chlorine effectiveness. Lower it to the target range for maximum sanitation.

Clean or replace the filter media Biofilm can linger in the filter. Backwash or replace cartridges to prevent reinfection.