Fish Mate Filtering Systems Fish Mate offers a range of 3 stage, high performance gravity filters for ponds from 1,000 gallons to 5,000 gallons. Gravity Models require installation at or about desired outlet level such as at the top of a waterfall. The medium and large models feature removable bio media trays for easy maintenance. In addition, Fish Mate's design of Fish Mate UV + Bio Gravity Pond Filters combine UV clarification and biological filtration to guarantee crystal clear, purified water at a very attractive price. All models feature UV tubes positioned over the water, thus eliminating problems of safety, scaling, quartz tube replacement and frost damage associated with conventional UV clarifiers. These gravity models also require installation at or about desired outlet level such as at the top of a waterfall. The new revolutionary design of Fish Mate Pressurized Pond Filters with or without UV are for ponds from 500 to 6,000 gallons. The Fish Mate Pressurized UV + Bio Pond Filters also combine UV clarification and biological filtration to guarantee crystal clear purified water. Both designs allow easy installation above or below ground. Designed especially to power waterfalls! Certain models features POWERCLENZ, an automatic cleaning system providing pondkeepers with less pond maintenance! All Fish Mate Filters are colored green to blend easily with natural surroundings.