We at Dankoi take great pride in understanding the unique needs that Koi require when it comes to filtration. We can supply the latest products from The Nexus Eazy, Bakki Shower systems, Multi Bay filters, OASE, BubbleBead, UltraBead and many more.
Filtration technology changes, and you can trust in us to be ready for you.
Follow the links at the top of this page to begin viewing our wide selection of filters.
Most filter media have a mechanical function. Settlement chambers allow gravity to drag the solid waste out of the water by slowing the water flow. Such chambers usually come first in a filter. A vortex unit provides greater settlement, the water moves in a circular movement allowing solids to gather in the centre where they can be removed. In addition to baffle plates which slow the incoming water, brushes or matting can be used to strain the water.
This relies on specific bacteria to break down toxic waste products to less harmful substances. There are two stages in the breakdown of ammonia, each stage involving different types of bacteria. The first stage is the breakdown of ammonia to nitrite by nitrifying bacteria, most important of which is Nitrosomonas. The second stage is the conversion of nitrite to nitrate by Nitrobacter.
Activated carbon removes ammonia and other organic waste products by adsorption, this means that the waste substances become linked to the surface of the carbon. When the surface is full up it has to be replaced.
Zeolite removes ammonia and nitrite from the water. A good feature of Zeolite is that it can be cleaned by soaking in salt water (6g per litre) for 24 hours and then reused.
If a large biological filter is present chemical filtration should not be needed, but it is good to use while the biological filter is maturing or isn't big enough for the pond.
Sand filter. Some Koi keepers use a sand filter as a final stage to polish the water. The water is passed under high pressure through sand and comes out very clear, bacterial activity also takes place in the sand filter. Sand filters are expensive though, and you can't make one yourself because of the high pressure involved.