Yellow Algae or Mustard Algae

Duckman's Pools LLCWhat is it?

Mustard algae are a chlorine-resistant form of green algae that often resembles dirt or sand on bottom or sides of pool. These algae contain compounds that act as a defense mechanism against the oxidation efforts of sanitizers, helping it survive even in highly chlorinated conditions. This factor can even create a large chlorine demand in certain situations. Mustard algae can be brushed away very easily, but returns quickly.

To Kill Mustard Algae:

  • Use Banish® as it kills all types of swimming pool algae.

Important Note: Brushing is extremely important when treating black algae because that protective layer has to be broken in order for the sanitizer or algicide to come in contact with the cells.

5 Steps to Prevent Algae Growth:

1. Maintain a sanitizer residual of 1-3 ppm

2. Do an initial and weekly application of a preventative algicide (such as Backup® 2)

3. Shock routinely

4. Make sure there is adequate circulation and filtration

5. Brushing surfaces is vital!