Genesis Water Technologies GWT-PE-10P-1 Polyester String-Wound Depth Replacement Sediment Filter Unit with One Micron Rating Measuring 10-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 10 inch by 2.5 inch size Proudly Made in America