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The Hydron TW-1812-50D Reverse Osmosis membrane produces 50 gallon per day and is designed for home drinking water, DI systems, office and certain Lab equipment use. The TW-1812-50's advanced membrane technology and automated fabrication, allow these membranes to deliver consistent performance, superb contaminant reduction, and true reliability. Features that equipment suppliers, water treatment dealers and residential customers globally can rely on. Fits any standard 1.8" x 12" residential RO membrane housing. For use in Drinking RO Systems and DI RO Systems. Fits any brand RO unit.