Oase filters are considered to be some of the best, and their Filtoclear box is one of their most popular and inexpensive models. Want something a little better? Filtoclear Premium models have since been released, featuring an integrated UVC to get you even better water quality.
The UV Clarifier makes a huge difference in ponds that suffer from Green water problems, caused by an abundance of free-floating green algae cells that are too small by themselves to be picked up by your filter. By shining UV light onto these cells as they enter your Filtoclear, the cells are fused together into large clumps, easily taken from the water and broken down by the fantastic biological media in these filters.