Why Pool Water Turns Green—and What to Do Next
Green water is a reason to investigate the pool’s condition, not choose a chemical dose from a photograph. Start with an assessment of water quality and the circulation system.
Several factors can contribute
Algae, debris, insufficient circulation and water imbalance can be involved. Recent storms, heavy use or equipment problems may also explain a change. A technician can test the water and inspect equipment before recommending treatment.
Pause swimming and investigate
Poor visibility makes it harder to see underwater hazards. Keep the pool out of use until the water and visibility are suitable. If a pump, filter or electrical component needs attention, use an appropriate professional.
Avoid a one-size-fits-all treatment
Treatment depends on testing, pool volume, products and equipment. Follow product labels and never mix pool chemicals together. A recovery may require cleaning, filtration, treatment and repeat checks rather than a single visit.
Prepare useful details
Note when the colour changed, recent weather, your usual maintenance routine and known equipment issues. Photos can help explain the situation but do not replace water testing.
Agree the recovery plan
Ask what work is included, how progress will be checked and whether equipment repairs are separate. Avoid promises of a guaranteed recovery time before the pool has been assessed.