... . sand filter:This filter can remove the impurity in the water like silt, grain, suspended matter , etc..2. active carbon ... ,the ozone can mix with the water better, and kill the germ in the water. 1raw water tankV=10m3, sus3042sand filterφ1500mm×H2400mm ... RO film6UV sterilizer10 UV lights7ozone mixer tank50g/h Ozone generator and φ450mm×H3200mm×δ3mm tank8pure water tankV=10m3, sus304 filter RO system