Qualitative Filter Paper 11Cm Lab Filter Paper For Chemistry,, 100 Discs Product Details GRADE 4 : 11cm - Equivalent to Whatman qualitative grade 4, standard lab filter paper (110mm) FAST PRE-FILTER - Quickly clean-up biological samples and organic extracts, routine clarification WINE MAKING - Filtration of musts HIGH AIR FLOW COLLECTION - Collect large particulate in fast moving air or fumes COARSE RETENTION / FAST FLOW - Retains coarse and gelatinous precipitates (20~25 micron) 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.