Dharmendra; You mentioned having a 2 micron filters before the HP pump. To me it seems overkill to have such a small filter and pressure differentials on  2 micron filters are greater than a 5 or 10 micron. My recommendation is to have a 5 or perhaps a 10 micron filter. Do you have pressure differential gauges on your 2 micron filter?  What is the DPSI on your 2 micron filter? What is the reason for having the carbon filter for pre-treatment? Do you have oxidation prior to this carbon filter?

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Dharmendra;
You mentioned having a 2 micron filters before the HP pump. To me it seems overkill to have such a small filter and pressure differentials on  2 micron filters are greater than a 5 or 10 micron. My recommendation is to have a 5 or perhaps a 10 micron filter. Do you have pressure differential gauges on your 2 micron filter? 
What is the DPSI on your 2 micron filter?
What is the reason for having the carbon filter for pre-treatment? Do you have oxidation prior to this carbon filter?