6 Stage Dual Use (Drinking & 0 PPM Aquarium Reef/Deionization) Reverse Osmosis Water System (RO/DI) w/pH Alkaline Mineral Restoration Filter DUAL USE REVERSE OSMOSIS WATER FILTER SYSTEM DI FOR AQUARIUM USE OR ANY OTHER APPLICATION NEEDING DI DRINKING WATER AND COOKING AND OTHER HOUSEHOLD USE.2 OUTLET.FOR DI OUT LET WITH TUBING AND STRAIGHT BALL VALVE.VIA INLINE CARBON FILTER FOR TASTE AND ODOR REDUCTION FILTER CONNECTS TO RO FAUCET.COMES WITH THE FOLLOWING: 5 TO 6 STAGE WATER FILTRATION SYSTEM1. STAGE SEDIMENT FILTER 5 MICRON2ND STAGE CARBON BLOCK FILTER 5 MICRON3RD STAGE GAC WATER FILTER4 STAGE MEMBRANE 100 GPD5 STAGE DI WATER FILTER OR INLINE ALKALINE FILTER GOES TO TUBE WITH STRAIGHT BALL VALVE.In the box: System, All tubes, garden hose adapter, fittings, and wrench. Basically everything you need to get ultra pure water. For every gallon the unit make it rejects three gallons of waste water. This is a standard industry norm with all RO systems regardless of the brand. The best ways to reduce waste water are by adding an Aquatec erp pump or water saver kit (double membrane).