There are as many different types and configurations of filters as there are people wanting to get rich off manufacturing and marketing their own filters. Almost every koi pond or water gardening magazine contains more advertisements for filters than any other product. Which one is the best? First, let’s discuss the various types that are available.The most common filters are the up-flow, down-flow, submersible, recycling and best shower filters pressurized types.
The most common problem plaguing the operation of any filter is channeling. Water will always take the path of least resistance. Filters use a variety of filter media or material for the water to pass through. Pond water contains a large amount of suspended matter that collects in this filter media, eventually blocking or plugging the spaces between the material. As this occurs, the water will divert to another available path until it, too, clogs. Eventually, the water flow will find a permanent channel, avoiding the filtration process altogether until the media is removed, cleaned and replaced. In the case of a down-flow filter, it operates on the principle of gravity, as opposed to pressure or up-flow. So when the media begin to clog, gravity is not sufficient to force the water through the available channel at the same rate that water is being pumped through, so it spills out the overflow drain back into the koi pond, unfiltered.The most efficient and maintenance-free filters are pressurized filters that have a backwash feature. A bio-filter contains filter media on which nitrifying bacteria reside, and which break down the toxic nitrites into less toxic nitrates that can be used by the water plants. Consequently, the more surfaces that are available per square centimeter of material, the more effective the filter.
Recent technology developed by Aqua Ultraviolet produces special hexagonal beads for their pressurized filters, which possess the greatest maximum available surface area of all existing filter media. They are tapered so that the beads are less likely to group together. Back washing forces water through the filter in the opposite direction, breaking loose solid material and flushing it free down the drain outlet. Or, with the use of a flexible ribbed hose, it will direct the nitrogen-rich waste-water onto the lawn, trees or flowers. Maintenance involves a simple turn of handle for about one to two minutes.
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