Complete Filtration Services, Inc. Cfs Product Details Compatible for 20-Inch, EQ-304-20 Sediment Pre-Filters for Whole House Water Filter Systems, 4pk The sediment pre-filter is designed to prevent dirt and particles from entering the system and clogging the main filter unit. Designed for easy filter replacement, no plumber required. Filter should be replaced every 1-3 months depending on TDS levels (total dissolved solids) and water quality - replace when you notice that the color of the filter darkens or water flow slows down. Compatible for 20-Inch, EQ-304-20 Sediment Pre-Filters for Whole House Water Filter Systems, 4pk Designed to prevent dirt and sediment particles from entering and clogging the main filter unit Replace filters every 1-3 months depending on water quality and sediment levels - when color darkens or water flow slows Replacements made easy - no plumber required The 20 inch sediment pre-filter is used to prevent dirt and sediment particles from entering and clogging the main filter unit. This cartridge should be replaced every 3-6 months depending on water quality and sediment levels. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.