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Green Pool Water: How to Treat it

How to Get Rid of Green Pool Water for Good


Green pool water, which results from algae overgrowth in the water and on the pool walls and floor, is no fun for pool owners. Cloudy, slimy water that is infested with algae and other debris isn’t just unpleasant to look at, but it’s unsafe for swimmers and for the structure of your pool as well.

If you’ve determined that algae is your problem and want to turn that green pool water back to the blue, sparkling water that you’ve been dreaming of, follow our easy steps for getting rid of green pool water for good.

Tools You’ll Need:

How to Clean Up Green Pool Water:

1. Determine what type of algae you have

There are different types of algae that can develop in your pool, turning it that unappealing shade of green. Do you know what type of algae you are dealing with?

  • - Green algae is likely your problem, as this is the most common type of algae that affects home pools. Pool owners typically find green algae floating on the surface of the pool or growing along the walls. This type of algae gives off a slimy feel and look to your water.

  • - Mustard algae is typically found in the shady areas of a pool, and always on the walls. It’s one of the toughest type so algae to keep away, so it has to be cleaned up as soon as you find it to prevent it from spreading, and you have to make sure you follow up with a good pool algaecide.

  • - Black algae is definitely the worst type to have in your pool, and it can show up in the form of small spots that seem harmless, but they actually have roots that can grow right into the plaster or grout of the pool. In the worst cases, big chunks of the pool have to be removed in order to get rid of black algae, and it doesn’t take long for this type of algae to become a problem. If you notice black algae, it’s a good idea to have your entire pool area inspected by a pool professional before proceeding with cleaning so that you can get a good idea of just how extensive the damage is.

2. Clean the pool completely

To get rid of algae, you must clean the pool from top to bottom. Pool cleaning pros recommend starting out with a pool brush for the walls as a way to “pre-clean” the pool, as this will loosen up a great deal of the algae on the walls, steps and floor. Next, run an automatic pool cleaner or use a manual pool cleaner to clean every inch of the pool, ensuring that all debris and plant matter is completely removed. Be sure to clean any pool toys and accessories as well, as these can also develop algae growth if they aren’t cleaned and thoroughly dried when storing for the winter or when they aren’t used for long periods of time.



3. Maintain proper water chemistry

Using a water test kit, check your pH levels and add pool chemicals, including pool shock and chlorine in order to reach the proper levels. Run the pool pump for 12-24 hours after each addition of chemicals in order to really flush the chemicals through. This is the best way to ensure your water will be as clean as possible.

4. Use Pool Algaecide regularly  

Regular use of pool algaecide will help keep algae blooms at bay and will help prevent all types of algae from developing in your pool. It’s a small price to pay for keeping your pool water safe all season long, and it will make it much easier to maintain clear water while also protecting your pool.

With proper maintenance and the right products, you can quickly and effectively get rid of algae problems in your pool and can help keep future problems from developing. All it takes is some deep cleaning to get rid of existing algae buildup and the right products to keep it from returning, and you’ll be able to enjoy blue, clean water that is slime-free and never green.

Doheny’s Recommends:

- Super Algaecide Plus