Achieve increased output capacity compared to the standard model and maintain the same cost per gallon by purchasing this refill kit. Shipped direct, containing one refill for each unit weighing approximately 50 lbs each of dual bed premium product virgin resin supplied in hydrogen/hydroxide form to completely fill the system. All the tools needed to refill your dual bed commercial model deionizer will also be included. This is the most economical way to buy your resins. There is not an easier way to produce pure water.