Green Pool Recovery: How to Clear a Green Pool

A green pool is caused by algae — and the longer you wait, the worse it gets. Here's how pool professionals restore green pools to crystal-clear water.

Why Pools Turn Green

Green pool water is caused by algae growth, which happens when chlorine levels drop and conditions (warmth, sunlight, nutrients) allow algae to bloom. Common triggers:

Low or zero chlorine levels
Extended period without maintenance (vacation, winter neglect)
Heavy rain diluting chemicals
High phosphate levels from leaves and debris
Pump or filter failure

Green Pool Severity Levels

Light green: Water slightly tinted, bottom still visible — easiest to treat
Dark green: Significant algae bloom, bottom not visible — requires multiple shock treatments
Black/swamp: Severe neglect — may require partial or full drain, acid wash

Green Pool Recovery Process

Test water chemistry — pH, chlorine, alkalinity, cyanuric acid
Balance pH to 7.2–7.4 before shocking
Shock the pool — use 3–5x the normal chlorine dose for severe algae
Add algaecide for extra protection
Run filtration continuously for 24–72 hours
Brush pool walls and floor to break up algae colonies
Vacuum dead algae to waste (bypassing the filter)
Backwash or clean filter
Repeat as needed until water clears

Cost of Professional Green Pool Recovery

Professional green pool treatment typically costs $200–$600, depending on severity:

Light green: $200–$300 (1–2 treatments)
Dark green: $300–$500 (3–5 treatments over a week)
Swamp/black: $400–$800+ (may include partial drain and acid wash)

When to Call a Professional

If your pool has been green for more than a week, the bottom is not visible, or you've already tried DIY treatment without success, it's time to call a pool service professional. They have commercial-grade chemicals and equipment that clear pools faster than consumer products.

Bottom line: Act fast — algae blooms double every day. Find local green pool recovery specialists at poolservicemap.com.