Create added interest and filter your pond water at the same time by adding a spillway. This spillway will create a waterfall anywhere that you place it, while filtering and cleaning your pond water.
The Waterfall Filter should be located at the opposite end of the Pond from the Skimmer Filter. This arrangement insures maximum circulation, since the Pond Pump is housed inside the Skimmer Filter and the water is pumped to the Waterfall Filter and falls from there back into the Pond.
Waterfall and Skimmer Filters are to be sized to take into consideration not only the size of the Pond, but also the size of the Pond Pump needed to produce the desired Waterfall. Skimmer Filters are also mechanical Pond Filters, since they employ some sort of filtering material to keep the surface of the Pond clean. Waterfall Filters are also generally biological Pond Filters.