HEISSNER Flow-Through Filters

Pond filter systems for biotopes, garden ponds and compact fish ponds

Flow-through filters are high-performance filtration systems for larger garden ponds and ponds with fish populations. They operate with an open design, where water is continuously directed through several filter stages. Due to their high flow capacity, flow-through filters are particularly suitable for ponds with increased nutrient input or higher fish stocks.

The HEISSNER product range includes robust flow-through filters that are perfectly matched to Pond Pumps and ensure reliable, long-term water purification for outdoor use.

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Flow-Through Filters: 9 items

What is a flow-through filter?
A flow-through filter is an open filtration system in which pond water flows through several filter chambers arranged in series. During this process, debris particles are mechanically removed and organic pollutants are reduced.

Which ponds are suitable for a flow-through filter?

  • Medium to large-sized garden ponds
  • Ponds with higher fish stocks
  • Koi ponds
  • Systems with a larger water volume

What are the advantages of a flow-through filter?

  • High filtration performance for large volumes of water
  • Multi-chamber systems for effective cleaning
  • Easily expandable for larger systems
  • Suitable for continuous operation throughout the pond season

How long should a flow-through filter run?
During the pond season, continuous 24-hour operation is recommended to ensure stable water parameters. In winter, operation can be reduced or paused, depending on the depth of the pond and the local climate.

How often does a flow-through filter need to be cleaned?
Depending on the size of the pond and the waste load, cleaning is required approximately every 2–6 weeks. More frequent cleaning may be necessary if there is a high fish population or during the peak summer months.