I would spend a bit more on the Vertex RO/DI unit. It is 100GPD and has a built in booster pump and inline TDS meter. It is electronically controlled and automatically back flushes to clean the filter etc. every 15 minutes. It only produces about 1 to 1.5 gallons of waste for each gallon of RO so it is very efficient. And the price is good if you consider the price of adding a TDS meter, back flush kit and booster pump to a cheaper unit. I am fairly certain this is very similar to the unit I saw at a commercial water purification store where their only added step afterward was to UV sterilize the water after RO/DI.
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