Pool Troubleshooting /
How to Get Rid of Algae in an Above Ground Pool
To get rid of algae in an above ground pool, remove debris, brush all surfaces, vacuum loosened growth, and keep the filter running and maintained correctly.
Archive date: this article was written for PoolSkimmer on Oct 24, 2026 and given the earlier archive date of Dec 12, 2025 so the blog reads as an organized archive. It was not published on that date.
First steps in the face of an algae problem The priority is to put a stop to its spread and clear away what you can. Skim the leaves and other debris, then give the walls, floor, ladder and fittings a good brushing to work the algae loose from the surfaces. Should the water be cloudy or green, treat it as a green pool and make sure no one is in the water until conditions are safe for swimming.
Safety comes first: turn off the pump before you open the skimmer basket or get near any equipment. Reaching into suction that is running is not to be done. For all treatment and cleaning, refer to your owner’s manual and the chemical labels, and don’t forget your PPE when working with pool products.
The proper way to go about removing algae There is a method to getting rid of algae without just churning it up. A straightforward order of operations is best:
1. Shut down the pump. 2. Remove any floating matter from the surface. 3. Brush the entire pool, paying particular attention to corners, steps, the walls and anything around the fittings. 4. Vacuum the bottom for the debris and algae you have loosened. 5. Give the skimmer basket a clean out. 6. Inspect the filter and service it per the manufacturer.
Hayward’s maintenance tips suggest you brush the algae and debris in the direction of the main drain to facilitate vacuuming. With a manual vacuum, submerge the hose and head prior to making the connection and take your time with overlapping passes to ensure you are picking up everything.
What causes algae to persist? It is not unusual for algae to make a comeback if filtration and circulation are lagging. As Hayward will tell you, the system – the pump, strainer, skimmer, drains and filter – is what allows chemicals to do their job and keeps the water filtered.
You may find the pool turning cloudy or green once more for a number of reasons: - A clogged skimmer basket. - A filter that is in need of a wash. - Not enough run time on the pump. - Water chemistry that has not been tested with sufficient frequency. - Debris left in the water to nourish new growth.
Preventing future outbreaks After you have dealt with the algae, consistent care is required to keep it at bay. Hayward advises weekly brushing and filter checks, as well as ensuring the pump runs long enough each day.
Make it a habit to: - Maintain a water level that is right for the skimmer. - Test the water on a regular basis and apply chemicals in accordance with the label. - Backwash or clean the filter only as the maker instructs. - Trim back any trees in close proximity that are shedding into the pool.
While some guidance may speak of algaecides, they do not replace the need for proper vacuuming, brushing and filtration.
Time to call in a professional? If you are dealing with an electrical issue, damaged gear or a circulation trouble you cannot put your finger on, it is best to leave it to a qualified technician. The same goes for water that remains cloudy after you have put in the work, or if the algae seems to be an ongoing issue.
If the situation calls for more than the usual skimming and brushing, or you are in any doubt as to the safest course of action, put in a call to a pool service pro. And of course, do not be in the water while equipment is in disrepair or the conditions are not right.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)
- [Pentair U-3 skimmer manual: suction safety warnings](https://www.pentair.com/content/dam/extranet/nam/pentair-pool/pool-manuals/u-3-skimmers/395010028C.pdf)
- [SwimmingPool.com: Cleaning the skimmer basket](https://www.swimmingpool.com/maintenance/pump&filter/cleaning-the-skimmer&pump-basket)
- [CDC: Use pool chemicals safely](https://www.cdc.gov/healthy-swimming/media/pdfs/Pool-Chemical-Safety-USE-poster-p.pdf)
- [CPSC: Electrical safety in and around pools](https://www.cpsc.gov/safety-education/safety-guides/pools-and-spas/dont-swim-shocks-electrical-safety-and-around-pools)