Stainless steel AISI 304 filtering net 70 micron (washable cartridge D.M. 443/90). For filtration of: sand, scales, rust. Domestic use: filtration of drinking water, protection of taps, boilers, washing machines and other installations. Technical use: pre-filtration for water-pumps, irrigation systems, protection of industrial installations; filtration of brackish water (only RA-A stainless steel AISI 316 type available on demand). Average life-span: about 3 years. Maintenance: wash every 3 months.