Thanks Dave.  Thought I would throw it out there.  I don't have any experience 
with a HPLC pump.  What if the geometry were larger and the check valves could 
cope with a suspended solid?  Think on the scale of a small hydraulic valve 
body.


Dennis


>  HPLC pumps are made to deliver precise flows of organic (pretty much)
>  liquids. Even suspended particulates are going to mess with the valving.
>  Classically, the mobile phase should pass thru a millipore filter;
>  probably .3 um. Sorry to be a wet blanket.
>  
>  Dave

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