The Ideal H2O? 75 GPD 3 Stage Reverse Osmosis Unit was designed to be light, compact and economical for today?s gardening hobbyists. Utilizing a hybrid sediment/carbon filter and a full size RO membrane, this 75 GPD RO unit has the same great quality filtration as larger units in the market today. Built in 1:1 ratio flow restrictor. Assembled in the USA.