Atlantic Water Gardens’ Replacement Matala filter mat for Atlantic Pond Skimmer PS3900 provides superior water filtration for your pond or water garden. Matala mats create a three-stage mechanical filtration that reduces maintenance and extends the time between pond cleanings. Use Matala filter mats in conjunction with skimmer brushes or skimmer nets for superior water quality in your pond or water garden. Only includes green Matala filter mat. Please see Matala Mat Kits for Matala Filter Mats with support frames.