Algae in your pool can be the most aggravating part of owning a swimming pool! During our hot weather from May to September, algae can become a big problem. Algae can enter your swimming pool through wind, rain, or people. But by the time you see it, you’re probably not concerned about how it got there, just how to get rid of it!
Different types of Algae
Green algae is the more common of the algae’s found in swimming pools. It varies in color from blue-green to yellow-green to a dark-green. This type of algae can be found floating in the swimming pool, but can also be found on the walls. Your pool will become less clear, and have a green color to it. Green algae can grow in sheets and be slimy. It can be treated fairly simply with the right amount of brushing, shocking and algaecide.
Yellow algae is a wall algae. Mustard algae is often found in shady parts of the swimming pool. Yellow algae is a hard to get rid of! It often comes back. So if this is the algae that is in your swimming pool then it needs to be dealt with as soon as possible.
By far the hardest algae to deal with is black algae. It comes in dark black, green, or blue spots. It is a tar-like deposit. The spots are tiny, no larger than a dime. Black algae is more typically found in concrete or plaster finished pools because of their rough surfaces. It is known for a heavy slime layer and “skeletal growths” that make it impervious to normal chlorine levels. Black algae usually doesn’t have any effect on water clarity, it just makes your pool appear to have black spots on the surface. Once black algae finds a way into your swimming pool it is very difficult to get rid of. The roots are the key. They can extend into plaster or grout and need to be taken out or it will come back.