Aquatic Life 4-Stage 100 GPD Junior Reverse Osmosis Filter System What's In The Box: RO Unit with 1:4 Waste Ratio; Canister Wrench; TFC Membrane Cartridge; 1 Micron Pre-Filter; Solid Carbon Block Filter; GAC Filter Built-in wall mount bracket allows the unit to be hung and secured in place Garden hose adapter make it easy to connect to a faucet Auto shut-off valve stops incoming water supply when outflow is turned off Clear micron cartridge housing makes it easy to view when cartridge should be replaced