The Sand Blocker Well Screen from Maass Midwest features all stainless steel construction. The well screen consists of perforated stainless steel inner and outer tubes, with stainless steel fiberwool between the two for sand retention. Said to be resistant to plugging and erosion, its pore size distribution replicates sand size distribution. These well screens come in sizes ranging from 3 inches to 6 inches and in lengths ranging from 3 feet to 5 feet, with longer lengths available by splicing various standard lengths together. Maass Midwest