Cartridge filters are installed where water free of suspended substances such as sand, limestone scales and iron oxide is required. Once detached from the pipes, these substances damage or obstruct taps, shower heads and wall boilers. The normal 3/4’‘- 1’‘ – 1-1/4’‘ F-series filters are available with 60-micron CL washable stockings, to be discarded in 25-micron CCA wire-wrapped polypropylene (50, 10 and 5 microns on request), 100-micron CC carbon and CX stainless steel (25, 60, 200, 300, 500 and 1000 microns on request). The cartridge can be easily washed or replaced by opening the original semi-fold closure, which guarantees a perfect seal and makes the tightening keys obsolete.