Rusco 1-1/2-250-F Polyester Screened Spin-Down Filter System The Rusco sediment filters usecentrifugal separation technologyto filter sediment from water. The Rusco clear cover is made of high impact polymer resin for maximum strength and durability. The top of the Rusco system is made of PVC. The Rusco clear cover is made of high impact polymer resin for maximum strength and durability. The top of the Rusco system is made of PVC. The Rusco filtration system has a polyester screen filter.