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Maybe it's been a while since you've swum in the pool. But once you decide to jump in the water, you realize that the pool water is green. It is neither he althy nor safe to swim in green water. But what can you do in this case? So today we are going to talk about the reasons why pool water turns green and how to get the water clear again. Stay tuned…

Is the water in your backyard pool clear?

What can you do when the pool water is green?

Why is the swimming pool water turning green?

There are three reasons pool water turns green. Do you know what these are?

Green garden pool water?

A lack of chlorine

The first and most common reason for green swimming pool water is a lack of chlorine. Without chlorine in the water, the pool will quickly start to form algae. These can grow so much that the entire pool turns green in a day. The warmer the water, the faster this process occurs.

Lack of chlorine in the water can be one of the reasons why pool water turns green


The second reason pool water looks green (or yellow) is pollen. Pollen is produced by nearby plants and trees and carried into the pool water by the wind. Because the pollen is too small to be removed by a normal pool filter, the amount of pollen continues to increase throughout the year.

As the amount of pollen in the water increases, it begins to settle on the liner and may be mistaken for green or mustard algae. If the amount of pollen continues to increase, all the water in the pool may eventually turn green. Luckily, pollen is completely harmless and will have no adverse effects on you or your pool.

Pollen in water


The ultimate cause of green pool water is metals, usually copper. Metals can be supplied from many sources, e.g. B. from the spring water, from cheap algaecides or, if the water is acidic, from the metal components of the pool, such. B. the copper heating elements.

Metals in water can also stain blond hair

How to clean a green pool

Treating green pool water depends on why the water turned green in the first place.

First test your pool water

Removal of algae in pool water

Algae should be treated by adding chlorine shock and algaecide to the pool water.

Algae protect themselves with a slimy coating that can greatly reduce the effects of chlorine. While most algaecides do not kill the algae themselves, they do break down this protective layer, allowing the chlorine to kill the algae much more easily.

Apart from adding chemicals, you should also brush the entire surface of the pool. This breaks the algal blooms down into smaller pieces that are easier for the chemicals to kill.

Prevent the spread of Algia

Once the algae have been killed, the swimming pool water usually goes from green to cloudy before eventually becoming clear. This process can take a few days. During this time, the pool pump should run 24 hours a day so that the chlorine is evenly distributed in the water and the filter can remove the dead algae. You should also check the chlorine level at least once a day until the water is completely clear, adding additional chlorine whenever the level drops below 1 ppm.

Shock the Pool

Removal of pollen in pool water

Removing pollen from your pool water is more difficult as most pool filters do not filter fine enough to actually capture and remove the pollen. Also, most clarifiers are relatively ineffective on pollen. Skimmer socks placed over the skimmer basket will help remove pollen suspended in the water. However, these have to be changed frequently and can never completely eliminate the problem. In our experience, the most effective treatment for pollen removal is the addition of a flocculant.

Pollens are harmless but difficult to kill remove

Removal of metals in pool water

To treat a metal problem in your pool, you must use a sequestering agent. Sequestrants collect the metal particles to make it easier for the pool filter to filter them out.

After the sequestrants have done their job and the pool is clear again, you now need to remove the trapped metals from your filter. While a simple backwash will remove most metals, it is best to dry clean the filter to ensure all trapped metals are removed from the pool.

After all the metals have been removed from the pool, you should try to figure out how the metals got into the water in the first place.

Metal free garden pool


As you can see, there are many reasons for green swimming pool water. Metals, algae and pollen can turn your pool water green. Only by knowing how to tell them apart and having your water tested can you properly treat the problem and get your pool clean again.

Clean and safe for swimming

Enjoy the nice weather outdoors!

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