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The Pentek 255515-43 is the correct replacement filter cartridge for the following inline water filter systems:
The Pentek Inline Filter Cartridge GS-6RO-B 255515-43 is a Reverse Osmosis (RO) filter, and is made of coconut shell granular activated carbon (GAC). This Pentek carbon filter reduces bad taste and odor, as well as chlorine taste and odor from your drinking water. This GAC water filter also features a 5 micron rating for reducing contaminants from your drinking water in order to improve taste.
The Pentek 255515-43 specifications: