How We Clear a Green Pool in About 24 Hours
The slider shows a real Cypress recovery: deep green on the left, swim-ready on the right. Getting there is a process, not a single dump of chemicals. On the first visit we test the water, then brush every wall, step, and the floor to knock the algae loose so it is exposed to chlorine instead of hiding on the plaster. We then shock the pool with a heavy, measured dose of chlorine and set the pump to run continuously.
Once the algae is dead it turns from green to a cloudy gray or white and sinks. We add flocculant or clarifier when the bloom is heavy to speed that up, then vacuum the settled debris straight to waste so it never loads up your filter. A typical light-to-moderate green pool is swimmable in about 24 hours; a badly neglected pool that has gone dark green can take 48 to 72 hours of repeated treatment and filtration.
Mustard (yellow) and black algae are tougher cases. Mustard algae clings to shady walls and resists normal chlorine levels, and black algae roots into plaster and grout, so both need extra brushing, higher chlorine, and sometimes a second pass. We will tell you on day one which type you are dealing with and exactly how long your pool will take.
