Replacement Cartridge for the Lifegard Aquatics AF-94 Double Capacity Mechanical Filter Module. 20 micron. This Cartridges DOES NOT have removable pleats. It is NOT the cartridge that currently comes with the Lifegard Aquatics AF-94 Double Capacity Mechanical Filter Module, but it’s just as efficient. The AF-94-19 now comes with two of the R175025X Cartridges. This is a single 19.5″ Cartridge. Lifegard part# R172021.