Glacier Fresh Replacement Filter For Maximum Under Sink, S01 System,2 Packs Product Details Perfect Fit: Compatible with Filtrete* System 4US-MAXL-S01and 4US-MAXS-S01. Healthy Choice: GLACIER FRESH Filter Compatible with 4US-MAXL-F01. Any unpleasant taste or odor are completely removed, while health-benefiting essential minerals are kept. Filter Life: It is recommended that you change the filter either every 6 months or every 300 gallons to achieve optimum performance. Exquisite Design: Easy to install and operate. You can enjoy maximum water filtration without taking up a lot of cabinet space. Tips?Please be sure the part number is an EXACT match for your system before ordering. 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.