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Beadfilters are closed (pressure) vessels filled with millions of small plastic beads. These beads float and therefore provide a means of mechanical filtration and the enormous surface of these beads provides the biological filtration.

Mechanical filtration: the beads float in a closed vessel and are packed very close to each other. The pressure of the pump makes
the water flow upward through the beads. The small dirt particles will stick to the bead pack. The longer the filter is active, the more bio film there will be around the beads and therefore small particles can be filtered.

Biological filtration: the specific surface of the beads is about 1600m² per m³ (6 times more than a blue Japanese Mat), so the bio
film layer around the beads is extremely useful nor nitrifying bacteria that consume vast amounts of ammonia, nitrites and nitrates.

The fish load in the table is based on 1% feed per day. Recommended pump capacity: in a water column of 2 - 3 m (0,2 -0,3 bar) the
pump should be able to circulate 50% of the actual water volume per hour (see specifications of the various pumps).
Ponds larger than 40 m³ should have a pump with an actual capacity of 25% to 33% of the water volume per hour.