Our 75 gpd 4 stage Aquarium system is the first of our professional series aquarium reverse osmosis line. This powerful system includes all of the vital stages needed to produce low TDS water for your aquarium. It includes a 1 micron sediment reduction filter and a 1 micron chlorine removal filter to protect the powerful 75 gpd Dow filmtek reverse osmosis element. The final stage of this system is a 10 inch Deionization chamber that will give you that low TDS reading, Guaranteed! or your money back!