Water source: City tap water & underground water TDS ratio below 1200PPM. Water filtering system: Pre-treatment + RO system Optional post-treatment device: CH-1 Ozone mixer and water tank Specifications: 1. Quartz sand filter with S.S.304 housing and backwash valve 2. Active carbon filter and S.S.304 housing with backwash valve 3. PP sediment filter and housing 4. Hydranautics ESPA4040 RO membrane 12pcs (FILMTEC unti-pollution type RO membrane avaliable upon requirement) 5. Feed pump and high pressure pumps 6. S.S.304 piping system 7. Water flow indicator,TDS indicator, pressure indicator, control panel and switch and valve systems Features: 1. Optional choice for RO membrane washing: automatic control & manual wash, by chemical washing 2. Pure water water level control system, automatic water generating and stop system. 3. High pressure pump over-power protection system, power-shortage shutdown system.