Genesis Water Technologies GWT-PE-10P-.5 Polyester String-Wound Depth Replacement Sediment Filter Unit with 0.5 Micron Rating Measuring 10-Inch X 2.5-Inch Stringwound polyester replacement filter .5 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