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Foam in the pool: causes & instructions for the treatment of the pool water


Foam is floating in your pool even though you haven't organized a foam party at all? Then you should take action, because foam in the pool is not without reason.

© kvdkz /

For many, having their own pool is pure luxury. Only very few people see that this involves a lot of work. Not only does it need to be cleaned and serviced regularly, there can also be minor problems from time to time. For example, if algae spread out in the pool, the pool water turns brown or there is unwanted foam in the pool. The latter problem may be a funny idea at a pool party, but it is not a pretty sight for the pool owner. Because foam in the pool always means that something is wrong with the water. But don't worry, you can get the problem under control in a few simple steps.

Causes of foam in the pool

Surely you have seen a wave of foam carry you to the beach on a walk along the sea. This is not a pretty sight, is it? Especially if you want to bathe, you can do without this sight. But where does this foam come from and how and why is it created? This question is answered very simply:

There is always algae in open water and algae release carbohydrates, proteins and fats into the water when they die. If air bubbles form in the water due to the wind, the substances just mentioned and the algae residues envelop these bubbles and thus make them more stable. The result: foam is created, which is then washed onto the beach. As a rule, it quickly disappears on its own. Unless large algae blooms have just died, because then the foam usually stays on the water a little longer.

© Stephanie Jud /

But what does that have to do with the home pool? Quite simply: Foam formation in the pool mainly comes from proteins and surfactants. For example, proteins come into the pool from algae, leaves or insects. On the other hand, we often carry surfactants into the pool. After all, surfactants are mainly found in cosmetics such as hair and skin care products, sunscreen and make-up. But detergent residues in swimwear also contain surfactants. If air is now blown into the pool through the return nozzles, the same thing happens as in water. The air bubbles are enveloped and are deposited as foam in the pool.

Instructions: How to remove foam from the pool water

Step 1 - cleaning the pool:

As you have learned, algae, leaves and vermin can cause foaming. Therefore, you should first thoroughly clean your pool. Simply remove what is floating on the surface with a net. Of course, this also applies to the foam.

Then it's the turn of the floor. To clean it, you do not have to leave the water in the pool. The floor is easy, quick and thoroughly clean, for example with a floor vacuum. There is the right solution for smaller children's paddling pools as well as for flexible pool facilities and stable swimming pools, because you can use pool vacuums manually or semi-automatically. Finally, there are models that are connected to the pump via a hose, as well as battery-operated hand-held vacuum cleaners.

Step 2 - check pH:

Now you should check the pH of the pool water. If this value gets out of hand, algae and thus the unpopular foam have an easy time of it. To get a grip on this, you should keep the pH in the range of 7.4 to 7.6. In addition, the alkalinity should be in the range of 100 to 150 parts per million (ppm). These values ​​can be quickly achieved again with a pH lifter or pH reducer.

Step 3 - perform shock chlorination:

If setting the correct pH value did not help, you should carry out shock chlorination next. It is used to neutralize algae, bacteria, insects and other foreign bodies in the pool. Such shock chlorination is generally important at regular intervals, because otherwise germs and bacteria in the pool can cause diarrhea quickly. The best way to do shock chlorination is as follows:

❶ Clean pool and filter system. Use the backwash function for this.
❷ Change filter system from 'backwashing' to 'filter' after cleaning.
❸ Measure chlorine content. If it is below 5 mg / l, shock chlorination is carried out.
❹ Add a chlorine tablet to the pool according to the manufacturer's instructions.
❺ Now measure the chlorine content again.
❻ If the chlorine content is still below 5 mg / l, repeat step 4.
❼ Repeat steps 4 and 5 until the value is finally reached.

Important: Leave the filter system switched on for the next 48 hours and check the chlorine content of the water regularly. If the value drops below 5 mg / l, you have to chlorine again.

Step 4 - use defoamers:

A simple and quick solution is to use a defoamer. This dissolves the foam in the pool and prevents it from being created. However, you should still clean your pool thoroughly and test the pH. Because the foam was not created without reason.

Step 5 - exchange water:

If the steps just mentioned have not been successful, then you have to drain all the water out of the pool and let in fresh water. In between, you should clean your pool thoroughly.

Important: Always take a shower before visiting the pool

© Kzenon /

Now you also know why it is so important to always take a thorough shower before swimming in the pool. This is the only way to effectively prevent cosmetics, surfactants and the like from getting into the pool and causing foam to form.

⇒ Our tip:

Just put a garden shower in the garden. So you can jump directly into the pool from the shower. Anyone who thinks that you have to be very skilled at hand is wrong. Anyone can create a garden shower in no time at all. This video tutorial proves it:

As the online health portal PraxisVITA reports, it is also very important for your health that you always take a shower before you jump into the cool water. And not just for hygienic reasons. This was the result of an investigation by researchers from the University of South Carolina. This has shown that dangerous chemical by-products arise when disinfectants in pools and sweat, personal care products or urine come into contact with each other.