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http://www.machinemart.co.uk/shop/product/details/cbm240-1in-multi-stage-water-pump/path/booster-centrifugal-pumpsHi mate, that pump will do the job, stick a pipe on each end, and put on end in container and other in tank.
can I ask why you need to transfer from 25l barrels ?Would it not be less hassle getting a bigger tank then get a sub pump and 1 inch hose, pump about £20 in wickes and transfer hose about £20 from b &q.