Replacement RO Module (30 lph) for Option system. RO membranes remove water contaminants that are less than 1 nm diameter and typically remove over 99% of ionic contamination, most organic contamination, and nearly all particulate contamination.Compatible with:MEDICA 30/60/100 Mk2 & 3MEDICA-R 30/60/100OPTIMA 15/30/60 & PLUSPURELAB Option-E 25/50/80 (Elect)PURELAB Option-R 30/60PURELAB Option-S 30/60PURELAB Prima 30/60/90/120