This is a 20 micron pH stabilizing calcite/carbon inline filter with 3/8″ quick-connect ports (Pentek GS-10CAL-RO-H). 10″ x 2″ 20 Micron pH Stabilizing Calcite/Carbon Inline Filter w/ 3/8″ Quick-Connect Ports (Pentek GS-10CAL-RO-H) 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.
