Replacement Pentair High Flow Cartridge Filters are developed by LEFILTER Filtration. The high flow water filter cartridges are available in 6.75" outer diameter and 40" & 60" length. The high flow filter cartridges have featured PP media, hard central core, and a proprietary o-ring seal. High flow cartridge filter possess pleated construction with an outside to inside flow that provides maximum flow rates with low pressure drop.