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General information

Every pond owner should ask why effective filter technology is so crucial for a decorative, fish or garden pond. We would like to answer this question in the following.

A complete nitrogen circulation develops in a pond. The fish feed themselves with food from the pond or are fed. Waste such as fish excrement and food remains sink to the bottom of the pond. Organic plant remains such as leaves and grass also find their way into the pond. Microorganisms convert this material via oxygen consumption into ammonia NH4 (ammonium NH3). Ammonia is very poisonous to fish and other life in the pond. Various bacteria convert the ammonia/ammonium into nitrate NO2 with the help of oxygen.

Nitrite is just as poisonous as ammonia. In turn, special bacteria, with the help of oxygen, convert the nitrite into nitrate NO3. Although nitrates are only poisonous to fish in high concentrations, they are an important food for pond plants. A high concentration of nitrates in pond water can therefore lead to high algae growth and turn the pond into a “green soup”. This is no problem for your fish; it is just that you will no longer be able to see them! Certain pond plants can also choke if there is too much sunlight concentrated on the water and no longer produce the necessary oxygen.

In order to prevent what has been described above, it is essential to filter the pollutants out of the water and keep it in a healthy, clean condition.

The common filter technique used requires a lot of maintenance and is therefore very costly to use. In view of these problems, our approach was to develop a technology that would be both user-friendly and low in operating costs. We have achieved this with our patented HighFIL® series for circulation rates from 30 to 60 m3 and from 60 to 120 m3.

We have achieved this with our patented HighFIL® endless band-pass filter installations for circulation rates from 15 to 100 m3.

HighFIL® endless band-pass filter installations clean out swimming ponds, conventional garden ponds with low fish populations and also, of course, sophisticated Koi ponds at any time of the year – clear as crystal.

The pond filtering technology we have developed is groundbreaking. An automatically self-cleaning endless band-pass filter that independently monitors nearly all the burdens that endanger the biological balance. To optimise mechanical dirt separation we use a special stainless steel wire mesh with a mesh width of 48 µm absolute that has been tried and tested successfully in many different industrial applications. The mesh structure enables high dirt-catching capacity on the mesh surface, the best possible regenerability, low flow resistance and a flow rate of 11 l/min measured at dp=0.2 bar and 1 cm². The endless band-pass filter is easy to change and clean. A modular system means that individual adaptation to local conditions is possible.

Our product range encompasses compact installations and individual components. Our compact endless band-pass filter installations guarantee good accessibility to all components, thus facilitating maintenance work. Where space allows, we recommend the use of our patented water chute with a round bio-pond. But wherever space is restricted, we recommend our rectangular bio-pond with rounded corners inside. If no bio-pond is required we can offer our filter chamber with an antechamber.

We have generous, round biochambers (800 l and 1000 l capacity) for biological cleanout; the rectangular biochambers are 200 l smaller respectively. Our preferred biomedium is Helix.

The HighFIL® endless band-pass filter installations are available for both pump and gravity operation. This means we have the ideal solution for every situation.

We use moving bead technology for biological cleanout and have generous, round biochambers with 800 l and 1000 l capacity; the rectangular biochambers are each 200 l smaller. Our preferred biomedium is Helix.

To ensure long life, all the bio-ponds are made of GFK and not stainless steel in order to exclude gap corrosion completely.

We have GFK lids for all band-pass filter versions. This dampens rinsing and water noises.
The water required for rinsing is taken from below the filter chamber.  We use Lechler flat-spray nozzles to rinse the filter band and dirt pan, which are both easy to clean. We generate the required rinsing pressure of at least 8 bar with an Ebara slush pump.

We recommend amalgam immersion emitters for UV purification. All compact band-pass filter installations are equipped with an emergency spillway. In gravity plants dry run protection is provided for pumps connected in series and there is overflow protection installed in pump plants.


High FIL®
HF 25-BP

High FIL®
HF 50-BP-RB

High FIL®
HF 50-SK-EB

High FIL®
HF 50-SK-EB

High FIL®
HF 50-SK-EB

High FIL®
HF 50-SK-EB