At this point, I'm willing to bet it's pump cavitation. GE link about cavitation (should have read it before my first post ;p)
Does the problem decrease/go away if you slow the velocity of the water by putting a restriction on the outlet (pinch the hose with your fingers quick)?
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Everything aircooled  (I honestly don't know why you guys let me stay a member...  )
Always folding:
WXP Pro:
KD7R + Palomino 1800+
W2K3:
4x P3 Xeon 500 512KB (4 clients)
Linux boxes:
none  Had to put them to use doing *real* work.
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