The boiler manufacturer will ...

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The boiler manufacturer will specify the water quality required. There are many different boilers and boiler applications.  RO usually is the last step after softening, filtering and polishing out any solids.  Ion Exchange water is necessary on almost all boilers.  RO is expensive and only justified if the manufacturer and application call for such high quality water.  Of equal importance is chemical pretreatment of the boiler water and consideration of the conductivity limits of the boiler.  Microfiltration and UUltra filtration are membrane technologies similar to RO but give results that might be sufficient for many high end boiler applications.  RO water and DI water is very corrosive and must be considered in the overall water management of boiler feedwater. Billg@prochemtech.com