How can I get rid of algae in my swimming pool?
Test the Water, Brush the Pool, Treat the Algae, and Clean the Filter
The steps below outline algae cleanup for a chlorine pool. Choose treatment products labeled for your pool and follow their directions throughout the process.
Before You Use Pool Chemicals
Read each product label and wear the protective equipment it specifies. Never mix different pool chemicals together. Only predissolve a chemical when its label directs you to do so.
Identify the Likely Algae Type
These common appearances can help you identify the problem. If you are unsure what is growing, ask for help before choosing a treatment.
| Algae Type | Common Appearance |
|---|---|
| Green | Green-looking water, often with algae floating in it. |
| Mustard | Yellow or brown dust-like growth that clings to pool surfaces. |
| Black | Firmly attached black growth that forms a protective crust. |
Steps to Remove Algae
- Test and balance the water. Check free chlorine, pH, and total alkalinity. Adjust water balance according to your treatment product’s instructions before applying shock.
- Brush and remove debris. Skim the surface, empty skimmer baskets, and brush the walls and floor, especially areas with visible growth. Use a brush approved for your pool surface.
- Treat the algae. Apply a chlorine shock labeled for algae control, following its dose for your pool’s water volume. If an algaecide is needed, choose one labeled for the algae type and follow its application timing. See Pool Chemicals for treatment options.
- Circulate and clean. Run the pump and filter as directed by the treatment instructions. Vacuum remaining debris, and clean or backwash the filter according to its owner’s manual.
- Retest before swimming. Keep swimmers out until the water is clear and testing confirms it meets the treatment label’s swimming requirements. Do not rely only on a fixed waiting period.
Help Prevent Algae From Returning
Maintain water balance and sanitizer levels, keep the pool clean, and check that circulation and filtration are working properly. For more prevention advice, read Breaking the Cycle of Algae Growth.
If algae persists or returns after treatment, get help reviewing your water test results, circulation, and filter condition rather than repeatedly adding chemicals without checking the cause.
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