Fresh milk should always be strained through a new filter disk before cooling. Never reuse filters. High-quality non-gauze filter disks allow faster milk flow, remove more fine sediment, and give more uniform filtering than gauze-faced disks. Standard 6-1/2" non-gauze filter disks fit large standard strainers and can be used with smaller strainers (let edges stick out). Box contains 100 disks. Discount for 3 or more boxes.