... auto start when no water, Auto backwash, IC microcomputer control system, auto backwash RO fil, raw water and well water conductivity ... displayed on line.3, Reverse osmosis desalination rate more than99%, system desalination rate more than 97%, filtrating rate of organic matter ... 10≤400RO-500-A is reverse osmosis +Mixed bed (zwitterions exchange column) outlet electrical conductivity is within 0.1-1.0us ...