1. Compatible Replacement: This 30 Micron 20 x 4.5 sediment water filter is a replacement for Hydronix SWC-45-2030 and fits most 20 inch water filter housings. 2. Filtration: The high capacity string wound polypropylene sediment filter is able to achieve filtration down to 30 microns improving water quality, and reducing sediment, rust, dirt, sand, silt, and corrosion. 3. 6 Month Filter Life: Depending on the quality of your water, replacing your home water filter cartridge every 6 months is recommended for the average household to ensure optimal performance. 4. Materials and Design: Products undergo strict quality assurance testing and are manufactured using the highest quality materials.