Hydraulically balanced reverse osmosis systems are used for various commercial applications. It is used in laboratory grade water to remove the organics and microorganisms plus minerals that can affect repeatability and test data. These are used for pretreatment on deionization systems, ice machines, battery water, pretreatment of humidifiers, metal finishing and drinking water supplies. It is also used in kidney dialysis water to remove the entire potentially dangerous mineral from the water supply.