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How to Get Rid of Algae in a Pool

Algae growth is extremely common in most swimming pools, and it is the last thing you want to see growing in your swimming pool when you go to take a dip. When preventing algae blooms, it is important to keep your pool clean, however sometimes we get busy, and the pool gets pushed to the wayside without much thought; until you go to get into it. Read on to find out how to get rid of algae in a pool.

get rid of algae in pool

Cleaning Your Pool

The first step in ridding your pool from algae is to, of course, clean your pool. Be sure to scrub the walls and floor with a pool brush. This will remove the algae immediately, however this needs to be done often to keep the algae growth at bay. You can do this one of two ways; you can drain your pool and it may be suggested depending on the depth of your pool, or you can walk along the edge of the pool and scrub the walls and floor from the edge.

Chemicals and Levels

The next step in the process of removing algae from a pool is to check the pH levels. You want to ensure that your pH levels are between 7.2 and 7.6, as the next step is to shock the pool. The pH levels are important since chlorine won’t work well with high pH levels. The chlorine is what prevents organic growth within your pool. Once you are sure the levels are within the appropriate range shock the pool with chlorine per the instructions on the packaging. Be sure to leave the filter running as you go through this process as it will filter out the dead algae and keep the filter running 24 hours a day. If after 12 to 24 hours the pool does not appear to improve, repeat the process of shocking the pool until the algae is gone from the pool.


Once the algae is dead, it will turn white or gray and either float in the water or sink to the floor of the pool. This is a good sign that the algae, which was a problem before, is no longer going to be an issue as long as the pool is properly cared for. Now we need to vacuum the pool to remove the dead algae as it can cause issues with the filtration system if not removed. When all of the algae is removed the filter should be back washed and cleaned to ensure there is nothing plugging up the filtration system. If the system is clogged in any way, then the algae will just grow right back.

Preventative Measures

The final steps in this long process of how to get rid of algae in a pool concludes with the addition of other chemicals to ensure your pool stays nice and clean with little to no effort. You want to test the pool levels once more and look for the proper measurements. From this point forward you want to continue adding chemicals to the pool on a weekly basis to prevent the algae from coming back. The chemicals you will want to use include an algaecide and a phosphate remover.

The chemicals will assist you in controlling the algae and keeping it at bay. You will need to add a phosphate test kit to your pool cleaning kit. If, when you test the pool, the levels are too high you will then need to add the phosphate remover and allow the filter and either robot or manual vacuum to remove the chemical over the course of 1 to 2 days. You need to clean your filter after each phosphate removal treatment to keep your filtration system working properly. If when you redo the phosphate test your levels are still too high, repeat the process until the levels are at zero.

Pools can be a lot of work to keep clean, but as long as you keep up with keeping them clean it can take as little as 20 minutes of work per week, depending on the size of the pool, to keep algae from growing. Another option that is available for people who enjoy their pool, but never have the time to clean them, is hiring a pool service that will check your pool once a week as well as treat it if needed. This of course does cost a bit of money, but you will never have to step into a green pool ever again.

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