As the temperature gets warmer, swimming pools are in more danger of developing mustard algae or yellow algae. Mustard algae is sometimes a light green or mustard color. Because it doesn’t like the heat, it generally forms when daytime temperatures reach 60 -75 degrees here in Arizona (spring and fall). Nor does it like too much sunlight, which is why it tends for form on the south walls of swimming pools.
Here’s where the trouble comes in. Most people tend to ignore their pool during the winter months, doing as little maintenance as possible. That’s a big mistake because now that temperatures are warming up, they are probably going to pay for their negligence. Once you’ve developed mustard algae, it is really tough to get rid of it.
Brushing the walls won’t get rid of the growth, and it can’t be killed with just chlorine. We recommend an ammonia-based algaecide. Some “yellow-out” products require extra chlorine and act as a chlorine accelerator. This means it depletes the chlorine in your pool as it kills the yellow algae. For every yellow-out type algae application count on buying an additional 3-4 times more chlorine to get rid of the yellow algae in your pool.
Our advice – start back into your summer pool maintenance routine right now!