Genesis Water Technologies GWT-PE-20P-1 Polyester String-Wound Depth Replacement Sediment Filter Unit with One Micron Rating Measuring 20-Inch X 2.5-Inch Stringwound polyester replacement filter 1 micron rated to remove even fine particulates Excellent for prefiltration to protect higher value filters and reverse osmosis units Standard 20 inch by 2.5 inch size Proudly Made in America