Atlantic’s Waterscapes line of FilterFalls filtration spillways is available in three convenient sizes. The BF1500 FilterFalls with 20.5" spillway and 1 1/2" Bulkhead is ideal for small ponds and/or water gardens with a 2,500 - 4,000 GPH pump flow. Each unit includes a FIPT bulkhead fitting, media bag, filter pad, removable bottom grate, liner attachment flange and a lifetime warranty on the enclosure.