Pool Water

Pool water - high standards of hygiene...

... Ultrafiltration is the ideal solution

This is demonstrated already by over 250 systems, with more than 25,000 m³/h with system sizes up to 420 m³/h – W.E.T. is the market leader for this!


Your benefits and advantages

  • High-end technology with ultrafiltration
  • Germfree water, no filter contamination
  • Fine filtration leads to fewer reaction partners for chlorine
  • Pursuant to the German DIN 19643 only half the volume flow compared to fixed-bed filters
  • Low internal height (2.0 m), transport through doors of 0.8 m width
  • Compact and flexible design adaptable to every room
  • No channel connections, low operational weight
  • No rinsing water reservoir, no rinsing waste water reservoir
  • Fully automatic operation, only chemical
  • containers need to be exchanged
  • Low operating costs, low operating pressures
  • Long service life of the membranes
  • Operational safety assured by remote monitoring
  • Highest level of safety for pool guest






Treatment must be so good that no additional chlorine is needed to reach the treatment target. The added chlorine serves only to avoid bathers from infecting others in the pool. Chlorine may not serve to offset the reduced functioning of the filter system.
You will be on the safe side with ultrafiltration!


Circuit treatment with ultrafiltration


Ultrafiltration systems for circulatory treatment in swimming pools.





Two-stage ultrafiltration in swimming pools for reduction of water consumption.





Standard ultrafiltration for circulatory treatment in swimming pools with an output of 32 m³/h.
Cost-effective, compact, tested in the field, and
parameterized for fast commissioning on site.





Circuit treatment with nanofiltration

Application of Nanofiltration in pool water treatment

Limit values are adjusted, new ones are published. General conditions and operating costs are changing.

Nanofiltration now offers the possibility of solving problems more individually.
The limits for chlorate and bromate specified in DIN 19643 or SIA 385/9 can hardly be reduced without dilution.

Other parameters, such as nitrate, oxidizability, ammonium, urea etc. could previously only be met by dilution. In countries witz limit values for the substances mentioned, complex measures are also necessary to comply with them.

In areas with a high content of organic substances in the fill up water, the pool water is polluted even without bathers. These organic substances are often the precursor to bound chlorine and other undesirable chemical compounds.

Nanofiltration is suitable for all types of pool water treatment processes.

It will be installes an partial flow system in the filtrate line after the filter in front of the heating and chlorination.

Retrofitting into existing poolwater treatment plants without intervention in the control system is very easy.

In the case of stailess steel pool, manufacturers specify a limit for chlorides, which can currently only be reduced by increasing the addition of filling water.

Too high chlorate or bromate values can also only be decreased by adding a higher volume of fresh water. Nanofiltration can reduce the required amounts of fill up water by a high retention rate for water constituents.

In the filling water contains many organic ingredients, the precursors for bound chlorine and other undesirable substances will be reduced. The layout of the nanofiltration system depends on the volume of water in the pool circuit, the visitor load, and the quality of the required flow capacity.

W.E.T. offers standardized nanofiltration systems from 400 l/h to 3.000 l/h permeate capacity.


There are strict regulations for therapy pools in Germany. Treatment that offers the highest level of hygienic safety is required. This is why a virus-tight membrane filter system according to DIN 19643-4 is authorised for ultrafiltration in therapy pools.

Further references for download


Ultrafiltration – the future standard
for highest demands...

...e.g. at „Four Seasons Honkong“

Here, an ultrafiltration system from W.E.T. ensures the highest hygienic standards in the treatment of vitality pools and whirlpools.

Anyone who offers his guests luxury also wants to be able to guarantee the safety and health of his guests. This is why more and more hoteliers worldwide rely on ultrafiltration in the wellness areas of the most prestigious hotels.

Further references for download