Atlantic’s Waterscapes line Skimmers come in two sizes. The PS4000 Skimmer with 6" Weir Door opening is great for smaller ponds and/or water gardens with a surface area up to 300 sq.ft. and a pump flow of 1,000 - 3,000 GPH. In addition to maintaining a beautiful, healthy pond, the Skimmer provides mechanical filtration for outstanding water quality. Each Skimmer unit includes removable lid, filter mat and basket and lifetime warranty on the enclosure.