I always recommend a waterfall filter for a pond as they make great biological pond filters. This type of filter is commonly referred to as a “Bio-Falls” by most pond keepers. They are very simple filters as they usually consist of a filter mat of some sort and a biological media (i.e. lava rock, bio balls, etc). Each bio-falls filter will have a pond size rating assigned to it so that you will be able to match up what filter works best for your pond. You want to make sure that you follow the manufacturer’s suggested flow rate so that you get a nice sheet of water coming off the filter’s spillway. To get the most out of one of these filters, I suggest replacing the nylon filter mat with a piece of coarse Matala media as this is re-usable and will not have to be replaced. For the bio media, I would suggest loading up a media bag with bio balls as they can be re-used and offer a lot of surface area for the beneficial bacteria to grow on. To get the most out of any bio-falls filter, I suggest using an air pump and running an air stone under the biological media. Doing this increases the bacteria’s activity, thus making the filter more effective. I also recommend cleaning the bio-falls every 4 to 6 weeks. When you clean these filters, it is important to clean the bio-media with pond water and to hose the mats off with tap water. By cleaning these filters on a regular basis you will be able to get the maximum performance out of them without creating back pressure on your pond pump!
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