Features 1. Our RO water purification system uses a 2-channel resistivity sensor to monitor system operation and water quality variation. 2. It comes with an interactive 4-line LCD display to show water tank level, conductivity, resistivity, temperature and date. 3. Patented pre-treatment cartridge helps effectively extend the lifetime of RO cartridge. 4. The water purification system utilizes a 30 liters standard water tank with internal pump and 5-level float sensor. 5. Flow restriction design keeps RO membrane surface wet, which helps prolong its lifespan.