A pump system for being set up to work in deep water, for use in sea bed mining; the system including three pipes, a first of which carries compressed air downward and to a lower portion of a main second or eduction pipe through which mined material is carried upwardly with sea water, and a third pipe also carrying bouyancy media downward to the lower portion of the main pipe, so to assist the upward flow of the water carrying the mined material.
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