Biological filtration utilises good bacteria found naturally in every pond to convert toxic nutrients (Nitrites and Ammonia) to Nitrates, a nutrient low in toxicity which plants use for growth. This process is called nitrification. There are two types of bacteria responsible for this process, nitrosomonas and nitrobacter. In most fishponds, there are not enough of these bacteria to keep up with the nutrients being released by the fish in the pond, so a simple way of increasing the amount of good bacteria has been found. Nitrosomonas and nitrobacter live on every surface of the pond, on the rocks, leaves, logs etc. So to increase the number of bacteria, we must provide them with a greater surface area to grow on. To achieve this, a filter box is constructed and filled with biological filter media. This filter media has a massive surface area to volume ratio, meaning that when water is pumped through the filter box, it goes past many billions of good bacteria, all converting the nutrients to safer forms. To see the specifications of our biological filtration media, click here.

Biological Filtration is The Fish Works area of expertise. The Fish Work’s subsidiary, Super BioMatt, manufactures biological filter media, which is currently rated the best on the market.

We stock a wide range of biofilters for waterfeatures and fishponds of all sizes.

Our range includes low-pressure trickle towers and fibreglass pre-fabricated biofilters for larger and heavily stocked koi ponds. We also have flow through canister type biofilters with and without UV sterilisers and also a range of biofilters with easy to maintain features which include filters which can be cleaned without even having to open the canister.

We stock Oase and Hozelock high and low-pressure filters.