i used design it two times . ...

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i used design it two times . it is a good technology .we need to treat all of the hardness to zero  , and control the PH like 10~11 to make the RO system to work . now your RO usually works in 90~95 % recovery.

if you want to discuss with me more , you can sent email to :  moonandbaby@163.com , i'm chinese.