This is a 10″ x 2″ 20 micron pH stabilizing calcite/carbon inline filter with 1/4″ FPT ports (Pentek GS-10CAL-RO-B). 10″ x 2″ 20 Micron pH Stabilizing Calcite/Carbon Inline Filter w/ 1/4″ FPT Ports (Pentek GS-10CAL-RO-B) This inline post filter is designed to dissolve calcite into reverse osmosis water to correct the low pH created by the RO process. The filter uses a combination of granular activated carbon and calcite to act as a post filter and neutralize low pH. This top-quality cartridge is made by Pentek, the largest brand in the filtration industry, and is NSF Certified. Model Maximum Dimensions Port Size Connection Type Chlorine Capacity @ Flow* GS-10CAL/RO-B 10″ × 2″ 1/4″ FNTP >1,000 gallons @ 1.0 GPM GS-10CAL/RO-H 10″ × 2″ 3/8″ John Guest >1,000 gallons @ 1.0 GPM * Based on manufacturer’s internal testing. John Guest Fittings for this unit are available below, or your existing fittings can be reused if they are removable.
