Pentek - GAC-20 - 20" x 2.5" Granular Activated Carbon Filter Calcite1468 If you notice pressure drop

If you notice pressure drop increasing before the rated capacity

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and RO pre-treatment where scale and corrosion control is needed

It's designed primarily for rural and agricultural areas where nitrate levels from fertilizer runoff or septic leaching exceed the EPA limit of 10 mg/L

Pentek - GAC-20 - 20" x 2.5" Granular Activated Carbon Filter Calcite1468 If you notice pressure dropThe Pentek GAC 20 is a 20 inch granular activated carbon filter designed for full contact chlorine and taste reduction in whole house and well water systems. Its flow through design with internal expansion pad and 20 micron post filter ensures maximum carbon contact without channeling or bypass. SPECIFICATIONS Pentek GAC 20 Technical Details Dimensions 20" x 2. 5" (2 7 8" OD x 20" length) Filter Media Granular Activated Carbon (GAC) Post Filter 20