Quantitative Filter Paper Circles, 150 Mm Diameter Cellulose Filter, Pack Of 100 Product Details Filter paper diameter: 150 mm Coarse cellulose filter papers remove particles 15 to 20 µm Filtration speed: 35 - 70 sec Ash content: equal or less than 0.01% Warranty: Labasics 1-year limited warranty; if received damaged, please contact us and we will solve it until satisfied 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.