DISCONTINUED - NO LONGER AVAILABLE - USE THE 66-4706G2 AND 47-55706G2 IN PLACE OF THE 66-4703G2 AND 47-55702G2. - Water Factory ® 66-4603G2 SQC Reverse Osmosis RO Membrane Replacement By 3M Purification. The most critical component to the reverse osmosis system function, the RO membrane module provides the means of separating fresh, clean drinking water from everyday tap water. Effectively reduces: Total dissolved solids, TDS, Lead, Cysts, Crytosporidia and Giardia, Barium and Radium, Selenium. For use with SQC 1 RO reverse Osmosis System.