Atlantic Matala Mat- PS4600/PS4900 Keep your pond water at its cleanest using the replacement Matala Mat for Atlantic Water Gardens Big Bahama Skimmer Models PS4600 and PS4900, The mat features a permeable design allowing water to pass through but trapping any solid debris, Place this mat above the biological media in the filter container to provide clean nourishing water to your pond and keep it fresh all season long, SKU: ATLWG124