5 Steps to Prevent a Green Pool After Heavy Rain

Test water chemistry before rain arrives Check chlorine, pH, and alkalinity a day before expected rain to ensure levels are not already low.

Raise chlorine to the high end of normal Bring chlorine to 3-5 ppm before the storm so dilution doesn’t drop it below effective levels.

Run the pump for extra hours during and after rain Circulation prevents algae spores from settling while rain dilutes sanitizer and drops pH.

Test again after the rain and shock if needed Rain washes in phosphates, nitrates, and algae spores, so recheck levels and shock promptly.

Use phosphate remover occasionally It helps reduce algae food sources, but it is not a daily necessity.