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How to Remove Algae Spots From Your Pool Liner

Floating Ring On Swimming Pool
Unless you want a pond in your backyard, your pool is not the place you want algae to grow. Algae is much like a mold that can grow in the hot sun. If your pool’s chemicals are not balanced or the pool isn’t cleaned or vacuumed often enough, then you may have algae growth.

Algae can eventually take over your pool and cause cloudy or murky water. Algae can also stain the liner of your pool, which may eventually wear it down enough to cause holes. Taking care of the algae problem when you first spot the issue is important. Read on for tips on how to remove algae spots from your pool liner.

What Does the Algae Look Like?

Most types of algae are not harmful to you, but it can be unsightly and harmful to your pool. Three different types of algae exist: green, black, and yellow — and all of these can grow in your pool.

Before you try to clean your pool liner, take a close look at the color of the algae you have in your pool. The color of the algae will help determine how you can remove it from your pool liner.

How Do You Remove the Algae?

Although green and black algae can be easy to get rid of, yellow algae can be a bit more difficult. Yellow algae can grow even if you have the right amount of chemicals and have vacuumed your pool properly.

Green and Black Algae

Green and black algae can be removed in the same way. First, you need to scrub your pool to remove as much of the algae that you can. Then, vacuum your pool — use the waste setting to prevent any algae from spreading throughout your filter and back into your pool. 

After you've vacuumed, add any water that may be needed as vacuuming on waste can lower the water level of your pool. You need enough water in your pool for the filter to be able to circulate and clean the water.

After you've added enough water, add chlorine to the pool. Add more than you normally would, as you want to chemically shock the water to kill any bacteria that is still in your water or system.

Test the chemical levels over the next few days and add any chemicals needed. Keep an eye out for any new algae growth. Be sure to remember to vacuum the pool again after a few days to prevent growth.

Yellow Algae

Again, yellow algae is a bit more difficult to remove. Look at the walls of your pool for a yellowish tint. Use a sock or sponge to wipe down the walls of the pool. Vacuum the pool on the waste setting just as you would for green and black algae.  Instead of adding chlorine to the water though, you'll need to add a chemical that will kill this type of algae.

Sodium Bromide is probably a good choice to use to kill this type of algae, as the chlorine may not affect the algae; however, sodium bromide is usually only effective once. To prevent yellow algae from coming back you should add algaecide according to the manufacturer's instructions.

After adding the sodium bromide and algaecide, the pH levels may be off. You may need to balance the pH levels and alkalinity levels in your pool. In fact, after you have killed the algae in your water, the best way to rebalance your pool is by taking a sample of your water to your local pool supply store for help.

Algae can grow in any pool, which is why it’s best to keep your pool clean and the chemical levels maintained. You should also brush your pool often to prevent dirt and dust from settling into low areas or creases of the pool liner. If you have a problem with algae and you aren't sure how to get your water clear again, call Pisces Pools & Spas for help.