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We have two returning pond filters. The first features a unique design that features all three types of filtration. UV (ultraviolet light) kills pathogens and algae, mechanical filtration which removes particulates that cloud water and biological filtration which breaks down wastes and converts ammonia into mostly harmless nitrates.

RO5000PF with UV

This filter also has a couple of unique features. One is that can be used both in the pond (submersed) or outside the pond as an external pond filter. Secondly, this filter can be used in series to increase capacity. The filtration system mimics the natural biological filtration that occurs in healthy ponds with the added benefit of UV to remove Algae and hidden pathogens that can harm fish.