Category
Water Care
Topic
Pool Care & Maintenance
/ Overview /
What Turns Pool Water Green
Green water almost always means algae. It grows when chlorine drops too low, circulation is poor, or the filter is not keeping up.
How to Clear It
Test and balance the pH.
Shock the pool with chlorine.
Brush every surface.
Run the filter around the clock.
Vacuum the dead algae.
If the water stays green after a few days, a professional green pool recovery is the quickest fix.
How Long It Takes
A lightly green pool can clear in one or two days. Dark green water, or water you cannot see the bottom through, can take up to a week of shocking, brushing, and filtering.
How to Stop It Coming Back
Keep free chlorine between 1 and 3 ppm, run the pump every day, and brush the pool weekly. Clean the filter once the water clears, since it will be full of dead algae.
Pay attention after heavy rain or a hot spell, when chlorine burns off faster and algae has the best chance to return.
Is It Safe to Swim?
Not until the water is clear and your levels are back in range. Green water can hide hazards and may carry bacteria, so wait until you can see the floor of the pool clearly.