Replacement Aquasana Eq-304-20 20-Inch Sediment Pre-Filters, 4 Count, For Whole Product Description Replacement 20-inch sediment pre-filters for Aquasana Whole House Water Filter Systems - 4 pack. Only use genuine Aquasana replacements for increased performance capacity and certified contaminant removal. 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. From the Manufacturer 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. Product Features Replacement 20-inch, sediment pre-filter for Aquasana Whole House Systems (4-pack) Use genuine Aquasana replacements only - untested replacements are not certified for performance capacity or contaminant removal 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 Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!