and all standard size RO's

This model is specifically designed to provide absolutely pure

Quartz sleeve

The ports openings require a 3/8" fitting

Power source: 2 x AA batteries (included)

4 Pack Filters Catalytic Carbon Upgrade ::5 Micron Carbon Block and all standard size RO's4 Pack This replacement filter pack is for all 10' standard size residential five stage R. O. systems. 1) sediment, 2) carbon blocks and a final taste and odor reduction filter. *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 Carbon cartridge in place of 5 micron carbon block. This