Carol:

 rental and hospital pumps ( actually one in the same)
are constructed diffferently and if there is a suspicion of milk back-up into
the motor than the pump most certianly must go back to the manufacturer for a
thorough clearing.

 <<  According to Medela, if it gets into the motor, bacteria can form and can
  be reintroduced into the freshly expressed milk. Unfortunately, there is no
  way to sterilize this >>

 so why don't we have disposable "hospital grade" pumps? >>

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