Mechanical, chemical, and biological filtration and protein skimming make this best filter for someone on a budget. The Eco Wet/Dry is you best choice for all inclusive filtering needs for you reef up to 75 gallons. It uses mini bio-balls for maximum surface area, with a large chamber for use mechanical or chemical media as needed. The built-in Venturi protein skimmer includes a (Rio-600PT) pump and features an easy off skimmer cup. This is a premium quality Eco Wet/Dry is constructed of high quality cast acrylic. It can be set up in minutes and is very easy to operate. Overall dimensions are 20L x 10W x 18H and is perfect for tight spots, great for corner bows. The bio-ball chamber holds 1.6 gallons of 1 inch mini bio-balls. There is a 1 inch threaded inlet and outlet (for external return pump). Maximum flow rate is 800 GPH and filtering capacity for this model is rated for 75 gallons. Quality is guaranteed by a full 3 year warranty. Skimmer and skimmer pump are included. Water pump is sold separately. FREE SHIPPING