Green Pool Water – What to Do?

Every pool or swimming pond owner knows it: summer is just around the corner, and with it, the swimming season. But when you look at the pool water in spring, it’s not just the pool robot that gets a fright. The pool is green and the water is cloudy. But what should you do when your beloved swimming pool is overrun with algae and dirt? The PROFI-Clean team will share some helpful tips and tricks for cleaning your pool.

Why is my pool turning green?

Basically, the green colour is caused by algae that settle in the pool through the air or dirt particles and multiply there. However, there can be many reasons for such a severe algal infestation:

Changing weather


Significant differences in ambient temperature can cause algae to increase rapidly in a short period of time. The ideal conditions are around 10 to 15 hours of sunshine and a temperature of 18 to 27°C. Heavy rainfall can also severely affect the pool by carrying organic material from outside into the pool water.

Water pH level too high or too low

Thanks to various testing systems, an incorrect pH level in the pool water is also easy to detect. Ideally, it should be between 7.0 and 7.4. If the level is below 7.0, the pool water is considered too acidic. If the level is above 7.4, the water often becomes cloudy, and limescale and other harmful deposits form.

Our PROFI-Clean tip: We recommend that you gradually adjust the pH level immediately after testing it using PROFI-Clean pH Minus liquid or as granules. Depending on how large the deviations are, the pH reducer can gently bring the pool water to the target level of 7.0 to 7.4.

The water needs to be disinfected

Basic hygiene is always essential in a pool, yet it is often not optimal at the beginning or end of the pool season. Stagnant water promotes poor cleanliness just as much as the various residues (dead skin cells, hair, dirt, sunscreen, etc.) that we carry into the water.

This is where so-called shock chlorination helps: this type of disinfection kills all microorganisms, dirt particles and algae in a single application.

Optimise the water quality: these PROFI-Clean products will help you

Prevent algae & deposits in the pool

There are also several precautions you can take to prevent the pool from turning green:

• Test the pH level and chlorine content once a week
• Perform regular shock chlorination (you can find chlorine here)
• Use algaecide
• Always shower before swimming

Keep pool equipment clean

If you have a filtration system in your pool, you should make sure that it is emptied and cleaned at regular intervals. If algae and other residues remain here after the water has been adjusted and cleaned, the water quality can quickly deteriorate again.

PROFI-Clean tip: You don't have a filtration system? Then you can also clean your pool by hand very easily. You can first remove large debris and severe algal growth with a brush and then clear it away with a net.

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The key to a clean pool in summer is to regularly check all measurements and adjust them to the target levels in good time. If the pH level and chlorine content get out of balance, simply stay calm and gradually counteract the imbalance with chlorine and pH Minus. Combined with regular cleaning cycles, nothing will stand in your way this summer thanks to PROFI-Clean.