In reality

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Check for fitting leaks

The Catalytic carbon will replace the 5 micron carbon block and is followed by a 1 micron or less filter before entering the membrane stage

Neptune Filter Pack with DI Tubing In realityNeptune Filter Pack with DI Replacement Filter Pack and DI pack for Neptune: 1) Ten Micron Sediment, 1) Five Micron Carbon Block or catalytic carbon, 1) One Micron Carbon Block and 3) Nuclear Grade Color Changing DI Resin cartridges. *Upgrading to a Catalytic Carbon stage removes on average 5 times more Chloramines than any carbon block on the market (including the ones specifically designed to "bust" chloramines). The option above adds Catalytic