Fast Flush feature - A mechanism connected to the system to allow flushing of the membrane to prolong its life.
DI Bypass - A valve which allows you to bypass the DI stage. Useful when installing and flushing new filters. Useful for extending the life of the DI cartridge.
RO Only - Water that's Used for drinking, cooking, etc... (DI is said to be unhealthy to consume)
Color changing DI cartridge - shows when the di cartridge needs to be replaced
Free setup kit of your choice: washing machine, sink faucet, in line, etc...
TDS tester ($40 value)
Automatic shut off valve (very usefull if you ever impliment it into an ATO system)