REPLACEMENT LINERS FOR: TheUltra-Filter Pad whichis a lightweight, portable solution designed to capture oil, fuel, grease, and other hydrocarbons before they can be washed away into soil, storm drains, or other environmentally sensitive areas. Its replaceable liner, made of our own oil-absorbent material calledUltra-Filter-Tex, is capable of absorbing an average of 13 times its own weight in oil while allowing large volumes of water to pass through.