How to Get Rid of Algae in a Pool
Recover an algae affected pool with reliable testing, restored flow, suitable treatment and removal of the residue.
Algae recovery works best as a sequence: establish safe access, remove debris, check flow, test, treat and remove the residue. Repeated chemical additions without those checks can leave the underlying problem untouched.
Keep the pool out of use
Do not swim in green or cloudy water, particularly when the floor cannot be seen clearly. Maintain the pool barrier. If floodwater, sewage or an unknown chemical entered the pool, seek incident specific advice rather than treating it as an ordinary algae bloom.
Confirm what you are seeing
Green material that brushes away, a slippery film and water with a clear green tint can have different causes. Photograph the water and affected surfaces before treatment. Review any recent metal containing products and water changes if staining is possible.
Restore the basics
- Remove large leaves and debris with a net or rake.
- Check the water level and accessible baskets safely.
- Confirm the pump holds prime and returns have normal flow.
- Check the filter against its clean pressure and maintenance criteria.
Opening baskets or filters requires the equipment’s isolation and pressure release procedure. A dry running pump or electrical fault needs attention before continuing.
Test and plan the treatment
Obtain reliable sanitiser, pH and wider water balance results, including stabiliser where relevant. Confirm the pool volume and exact product strength. Follow a treatment programme compatible with the finish and filtration. Never mix concentrated pool chemicals.
A salt chlorinator’s boost setting may not be enough for a particular recovery. Equally, more manual chlorine is not the answer to every green tint. Use the measured conditions to decide the next step.
Remove what treatment releases
Brush with a suitable tool and collect debris through an appropriate vacuuming and filtration process. Monitor filter loading and clean as required. Clarifier or settling flocculant should be selected only after confirming compatibility and a practical removal method.
Reopen by results, not a deadline
Confirm clear visibility, suitable tested chemistry and all treatment reentry requirements. There is no reliable promise that every green pool will be ready the next day. If chlorine cannot be maintained or the water stops improving, reassess the cause.
Read green pools after rain and flocculant suitability, or send photos and test results through emergency pool help.
