How to Fix a Green Pool and Kill Algae Fast

To clear a green pool fast in Texas, you must raise the free chlorine level to a 'shock' threshold of at least 10.0 to 20.0 ppm, run your pool filter continuously for 24 to 48 hours, and brush the pool walls twice daily to break down the algae's protective biofilm.

The Green-to-Clean Pool Recovery Steps

Algae blooms thrive in warm water when sanitizer levels drop. Follow this process to clear it:

1. Test and Balance pH: Muriatic acid or pH decreaser must be added to drop pH to 7.2. Chlorine is significantly more effective in slightly acidic water.
2. Super-Chlorinate (Shock): Add 3 to 4 gallons of liquid pool shock per 10,000 gallons of pool water to raise chlorine high enough to kill algae cells.
3. Brush Aggressively: Algae clings to porous plaster. Brush walls, floors, steps, and light niches to suspend the algae in the chlorinated water.
4. Run Filter 24/7: Keep the pump running to capture dead algae. Cartridge filters must be washed down, and D.E. or sand filters backwashed as pressure increases.
5. Vacuum to Waste: If using a flocculant to clump dead algae, use a bypass vacuum to pump the sediment directly out of the pool rather than passing it through the filter.

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