Hydro-logic Hydro-logicTM Stealth Compatible Membrane, 100 GPD by CFS Hydro-logic Hydro-logicTM Stealth Compatible Membrane, 100 GPD by CFS Standard equipment membranes compatible for Hydro Logic's reverse osmosis water treatment systems Available as a replacement part and will also fit most competitors' RO systems Helps to keep your water filtration system in tip top shape Stealth Membrane is a comatible replacement part for Hydro-logic's Stealth 200 Reverse Osmosis System