Six Activated Solid Carbon Block Water Filter MATRIKX + CTO/2 Cartridges. These cartridges are capable of removing chlorine and chemicals that impart adverse taste. They have a dirt sediment rating of 5 microns nominal. The projected chlorine reduction capacity is rated for 6000 gallons when tested in accordance with NSF /ANSI standard 42 protocol. The extruded carbon block design will ensure that this cartridge will perform optimally for 6-10 months before being exhausted. The 32-250-125-975 is ideal for under sink applications and can deliver up to 2.0 GPM.