Melt-blown polypropylene filtering medium - from 10, 25 or 50 micron (throw-away cartridge). High efficiency filtration of fine particles, rust, lime, sand, scale. Domestic use: filtration of drinking water, protection of taps, boilers, washing machines and other installations. Technical use: pre-filtration for reverse-osmosis membranes and for all applications when is required high efficiency on fines retention. Filtration of water and other liquids in industrial applications: chemical, petrochemical, photographical, electroplating, pharmaceutical, food industry. High efficiency pre-filter for U.V. lamp units. Post-filter for granular activated carbon units. Average life-span: variable, max 6 months. Maintenance: none.