The Puretec Hybrid G7 20" series filters with UV Radfire filter requires genuine replacement parts to ensure that your water is as clean as possible. This is the replacement 10 micron 4.5" x 20" dual purpose carbon cartridge filter for the G7, G13, R2 R11 and the EM2-110. This filter is 10 micron and filters out particles as well as reducing taste and odour in the water, the filter cartridge cannot be washed to increase the life so please change the filter for a new one at least every 4-months or more frequently if it becomes blocked. Please consider adding a 40mm 55 micron non-disposable filter and instal it before the Puretec filter, this will reduce the dirt load on the Puretec system and allow you to easily clean the Tagline filter which should last for 20-years or more. The Tagline filter has a stainless steel screen and can be easily removed and washed, it is not disposable.