This crystal waterfall box is great for new or existing ponds and watergardens. Biologically filters and aerates the water making the pond safe for fish while keeping the pond water clean & clear. 14-inch wide spillway width. Filters up to 1500-gallons. Max flow rate of pump is 2340-gph. Maximum pond size up to 8-feet by 11-feet. Kit includes, filter/waterfall unit, detachable weir, bio filter mat, mesh media bag, plumbing fittings, stainless screws, screw caps, liner clips, silicone and installation instructions. Also includes 1.5-inch fittings for kink free, vinyl or PVC flex hose. Measures 20-1/2-inch length by 20-inch width by 15-3/4-inch height.