What is required to convert a Spotless water DI system to the new DI system is quite straightforward. You simply remove the cartridges from your Spotless water DI systems and install the new feeder tubes (see photo). Refit the blue outer containers (without using the cartridges) to the Spotless water DI systems and then screw the cartridge body back onto the housing with the feeder tubes inserted directly into the resin.