the piece of filter material you jammed into the return line is an
accident waiting to happen as the filter material will load up and slow the
flow until your barrel overflows and pumps your pond down
Gale :~)

My first thought also. If OP can get to the opening/hose seems they could
enlarge it, perhaps with a heat gun and stretcher? ~ jan

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Also ponding troll free at:
http://groups.google.com/group/The-Freshwater-Aquarium