How a green-to-clean works
- Test the water and check that the pump and filter are actually running
- Remove heavy debris and brush every surface
- Shock and treat to kill the algae
- Run the filter continuously and clean it repeatedly as it loads up
- Vacuum dead algae (to waste when the filter can't keep up)
- Rebalance the water once it clears
Why pools turn green
- Chlorine ran out during a heat wave or after heavy use
- The pump or timer stopped and water sat still
- High stabilizer (CYA) from years of chlorine tablets weakening the chlorine
- A dirty or failed filter
- Storm runoff and debris
How long it takes
Lightly green pools can often clear in a day or two. Dark green or swamp-like pools usually take several visits. Very neglected pools sometimes need a partial drain or an acid wash afterward.
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Frequently Asked Questions
Is it safe to swim in a green pool?
No. Wait until the water is clear and chlorine is back in range.
Do I have to drain my pool?
Usually not. Draining is mainly for very high stabilizer or calcium levels or when stains remain after cleanup.
Will it just turn green again?
Not if circulation, filtration and chlorine are kept up. Weekly service is the easiest way to prevent a repeat.
Can you clean a pool for a home sale or move-in?
Yes, a one-time cleanup works well for listings and new owners.