Nsf Certified Ao-Wh-Prev Whole House Water Sediment Filter By Ao Smith, With Product Details Sediment Prevention - The AO-WHO-PREV system is certified to reduce sediment, dirt and rust in your water, applicances and plumbing fixtures. Designed to bring you sediment-free water from every tap in your home. Easy Filter Replacement - The built-in shut-off bypass valve allows you to change filters witout turning off your water supply, and the pressure release button allows for quick, easy filter replacements. Uses universal 2.5 inch replacement cartridges (sold separately.) For Stand-Alone Or Combind Use - This Whole House Filter System can be used by itself or with additional A.O. Smith filtration systems, allowing you to customize your filtration system to fit your home's unique needs. Simple DIY Installation - Package includes filter housing, first sediment filter, and housing wrench. No plumber needed. NSF Certified - System is NSF Certified to standard 42 for the removal of particulate. 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.