-50% on a selection of fish food
A pond filter traps particles and hosts the bacteria that convert the ammonia produced by fish into nitrates. Size it according to the volume of the pond and its stocking level: a koi pond or a heavily stocked aquaponic system needs a filter rated for a volume well above the actual volume. Pressurised filters hide in the landscaping and can send water up to a waterfall; submersible filters sit on the bottom and go unnoticed.
A filter fitted with a UV-C clarifier also eliminates the suspended algae that cause green water. Replacement foams and media are in Filter media, and the article Green pond water will help you choose.
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