Waterite’s Vectapure NX 5-Stage Reverse Osmosis (RO) Water purification unit is a compact residential drinking water system with a fully encapsulated 400 gallon (1514.16 litre) per day membrane, a carbon filter and a sediment filter cartridges for prefiltration, and one carbon post-filtration filter cartridge. This unit purifies your water to below 10 Parts per million of Total Dissolved Solids (TDS) making it one of the best purification system on the market.