Every pond has its own biological equilibrium that can be supported by circulating and purifying the water. Smaller habitats in particular need the help of filters and pumps if you own fish or when the temperature rises.

Fish excrement, excess food, foliage and dead plants: The smaller the pond, the greater the danger that the ecosystem will not withstand this strain. Supporting your pond system with filters and pumps is especially necessary for small and medium-sized ponds with fish.

All pond filters basically work the same way: they suck in the water using a pump, pass it through a filter and sift out the dirt. Depending on the product, some pumps can also filter out fine, microscopic particles of dirt in addition to larger debris. Furthermore, the microorganisms that populate the filter material break down ammonia and nitrite. This process creates nitrate, a non-toxic substance for fish, which in turn is needed by plants in order to grow. Pulling the water through the pump also results in circulating the various layers of water, keeping them in motion, which in turn supports the natural metabolism of the pond.

In general, there are differences between pressure filters and gravity filters, as with submersible and external filters. Sand filters, foam sponges, filter inlays and fleece inlays are the most commonly used mechanical filter media. They have to be cleaned on a regular basis and may also need to be replaced after a certain time. There are also biological filter media such as special filter substrates like the Japanese filter mat or porous gravel. The mineral zeolite is also used to filter ponds.

But not every filter is equally well-suited to every pond. A general rule of thumb is that the volume of the filter and the corresponding pump should be based on the size of the pond and your fish stock. Your best bet is to ask for advice at your local specialty store. But whatever filter you decide on, regular cleaning is required so that it functions reliably.

There are various opinions as to whether a garden pond needs to be aerated further. Usually, circulating water through the filter is enough for smaller basins. That being said, there are also breeds of fish that need a powerful current and the oxygenation capacity associated with it, such as gudgeons and sturgeons. Koi also feel at home in flowing water. If you have one of these breeds, it would be a good idea to consider purchasing a flow pump to guarantee good water flow.

Call into your local store today to discuss your fish’s personal needs with our Maxi Zoo Pet Experts