Algae in your swimming pool can be the most aggravating part of owning one. We often get the question "how do I get rid of algae". First you have to find the source. Algae can enter your swimming pool through wind, rain, or people entering your swimming pool. Combined with poor circulation, the algae can thrive and grow in your swimming pool. At this point though you probably are not worried about how the algae got there, but rather how to get rid of pool algae.
Identify the type of algae- There are several types of algae that can grow in your swimming pool. Proper treatment depends on what type of algae is growing in your swimming pool. Green algae, is the most common form of algae found in swimming pools. 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 will have a green color to it. The wall green algae can grow in sheets and be slimy.
By far the hardest type of algae to deal with is black algae. It comes in dark black, green or blue spots. It is a tar like deposit and the spots are tiny, usually no larger than a dime. Once black algae finds a way into your swimming pool, it is very difficult to get rid of. What makes it difficult are the roots. They can extend into plaster or grout and need to be taken out or it will come back.
Vacuum the pool to waste- If you have to use your filter to vacuum, make certain that the filter valve is set to waste (sand or d.e. filters only). This will bypass the filter and force what you are vacuuming directly out of the pool. It is very important that you get as much as the algae out of the pool so they do not start forming again.