Quick take
Match the exact cartridge dimensions or OEM number, then compare media construction and replacement cost. Do not assume a cheaper compatible cartridge has identical dirt-holding capacity.
Match dimensions and part number
Measure cartridge length, outside diameter and opening style, or cross-reference the OEM part number. A near match can leak bypass water or fail to seat correctly.
Pleat area and media matter
More effective filter area generally means lower face velocity and more dirt-holding capacity for a given flow. Media stiffness and pleat spacing affect how well the cartridge cleans and holds shape.
OEM vs compatible
OEM cartridges provide a known fit and specification baseline. Compatible filters can reduce cost, but verify dimensions and avoid assuming the same lifespan or filtration performance.