Abstract: A filter cartridge for a pool or spa includes a fluid flow path into the filter cartridge, and the orientation of the fluid flow path is adjustable. A diverter may be provided within a housing of the filter cartridge for adjusting the orientation of the fluid flow path of the pool water entering the housing. The diverter may be detachable and allow multiple angular settings directing flow. Additionally, or alternatively, the filter cartridge includes internal vertical ribs for directing debris caught by the filter cartridge.