How to Stop Yellow Algae in Swimming Pools
- 1). Gather any object that's recently been in the pool and place on the shallow end. Yellow algae can grow outside of the pool area. Scrub those objects with the sponge.
- 2). Brush all the pool surfaces thoroughly to include the pool's immediate perimeter. Use a toothbrush to reach smaller surfaces like the pool drain or waste lines.
- 3). Test the pool for pH and chlorine levels. Add liquid chlorine until it reaches 10 ppm (parts per million) and the pH is 7.2. This is known as super-chlorinating or "shocking" the pool.
- 4). Run your filter to backwash the waste. This should eliminate any visible yellow algae you just scrubbed.
- 5). Add copper algaecide, which will target the unseen yellow algae spores. Purchase algaecide that targets yellow algae, although any other algaecide should help if it's not available.
- 6). Repeat brushing 24 hours after you applied the algaecide. Shock the pool again as in step 3. Wait 24 hours and test the chlorine. If chlorine is between 1 and 3 ppm and yellow algae is no longer present, you are complete. Otherwise, repeat steps 2 through 4 and test again.
