Process:

sand filter + carbon filter + PP sediment filter + booster pump for 1st stage RO + 1st stage RO + booster pump for 2nd stage RO + 2nd stage RO

Specifications:

Filtration capacity: 450 lites/hour, 25 deg.c
Input power: 2.75KW
RO membrane: ESPA4040  3PCS (2 stages)
Multi-stage pump: CDL2-180/2.2KW  1PC
Pre-filter (sand filter): (diameter)300 x (length)1,650MM  2PCS
PP sediment filter: (diameter)90 x (length)1,000MM 3PCS
Booster pump: BLC70/0.55KW  1PC
Quartz sand: 150KG
Active carbon: 50KG 
Dimensions: main body 1,550x900x1,820MM

Functions:

1) Automatically and manually wash RO membrane.
2) Manually wash RO memebrane with chemicals on machine.
3) Machine automatically stops when high water level of purified water, and runs when low level.
4) Multi-stage pumps protect the machine when lack of water.
5) Protection in such cases as no power, lower pressure, higher pressure, shot circuit, creepage, etc..
6) Large eletric current, creepage protect and so on.