How does a Natural Pool „work“?

Due to the natural design, the biological self-cleansing forces of the Natural Pool are extremely effective. Impurities are absorbed by the plants as nutrients and harmful bacteria are destroyed by natural water organisms. Thanks to the biological self-cleansing properties absolutely no chemicals are required. Technology is used to support and enhance the natural processes. BIOTOP has always attached a great deal of importance to designing technical components that are simple and easy for the user to understand.


Swimming and regeneration zones

In the planning of Natural Pools, generally the ratio of the swimming zone to the regeneration zone is 1:1 and the depth is at least two meters in the swimming area. This is the basis for a functioning pool. If more technology is use, the regeneration area can be smaller with less depth.

Little technology, as much nature as possible

A Natural Pool relies on nature for its low-tech filter system

A Natural Pool will function as it should if the regeneration area is designed correctly and the underwater plants are used properly. The pool is fortified with zooplankton (water fleas, rotifers, paramecia), which play an important role in keeping the water clean on a continual basis. All it takes is a little bit of patience until the pool finds its natural balance. A BIOTOP Natural Pool functions in perfect balance starting from a water surface area of 30 to 40 m2. And in terms of size, the sky’s the limit.

The Natural Pools Nature-Based Filter System by BIOTOP

Technical components

Biological Compact Filter

Biological Compact Filter by BIOTOPThe water in the Natural Pool is filtered by plants, micro-organisms and zooplankton. A biological compact filter can be used to assist in the process, which makes sense if there is not enough space for the regeneration zone in the garden. The ideal ratio of swimming area to regeneration area is 1:1.

Information Sheet

Submerged Pump Chamber

Submerged Pump Chamber by BIOTOPBIOTOP has a pump chamber that boasts a completely new design to ensure proper water circulation. The submersible pump is installed in a flooded pump chamber. The water flows into the pump chamber naturally and is not “sucked in” by the pump. The submersible pump sits on the floor of the pump chamber and transports the water into the Natural Pool through pressure lines.

Information Sheet

Curved Screen Skimmer

Curved Screen Skimmer by BIOTOPThe curved screen skimmer is a milestone in skimmer development. The water flows over a curved screen with a mesh size of only 0.3 mm. The advantage here is that the screen catches even the smallest of impurities and mucilaginous algae. The impurities are removed from the system before the nutrients they contain are released back into the water.
The screen is self-cleaning, as the impurities are washed to the bottom. A cleverly-devised mechanism regulates the water flow via a moveable skimmer flap that always allows exactly the right amount of water to flow over the screen.

Information Sheet

The Phosphorus Filter “PhosTec UPSTREAM“PhosTec Upstream by BIOTOP

The PhosTec Upstream phosphorus filter binds the phosphorus dissolved in the water — the main promoter of algae growth — efficiently and without the need for chemicals. This causes the algae in the water to “starve”. The water flows through the filter from top to bottom, thereby minimising the risk of the filter becoming clogged.

Information Sheet


Construction Methods

Select the construction method that you like the best. All three can be combined with one another.

Corner Element Construction by BIOTOP

Corner Element Construction

  • Pre-fabricated components
  • Quick and easy construction
  • Attractive design
  • Swimming area can be shaped as desired
  • Wooden cover provides seating

Concrete or Cinderblock Walls by BIOTOP

Concrete or Cinderblock Walls

  • Precise geometric shapes
  • Vertical walls from top to bottom in the swimming area
  • Higher investment in materials and costs
  • DIY construction is possible

Earth-Wall Construction by BIOTOP

Earth-Wall Construction

  • Gently sloping shape of the swimming area
  • Economically priced
  • Larger surface area needed due to greater width of earth wall

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