Water Treatment Plant RO Pumps Design

Can anyone ​help me to ​design the ​pumps in RO ​plants like (​well pump, ​high pressure ​pump). ​

How do we ​select sand ​filters, micro ​filters (​mathematically ​please, not by ​software ​depending on ​water well ​analysis) ​

Thank you in advance.

Ibrahim Elkasttawi
ibrahim_elkasttawi@yahoo.com