Pond filtration has come a long way since sponges stuck on the front of your pond pump. Cascade has always sold filtration systems suitable for the size of the pond and its stocking level of koi and pond fish. There are many shapes and sizes of filters available today but not all work as well as you would expect. There is a distinct difference in filtration for a pond with koi in and filtration for a koi pond.
This section on Pond Fitration is designed to help you with the basics of filters for small to medium ponds up to 1000gallons/4500Ltrs, probably with a mix of pond fish and plants. Please refer to Koi Filtration for larger pond and koi filters.
