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Unread 10-16-2002, 03:39 AM   #9
MadDogMe
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Join Date: Aug 2002
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I always thought of 'closed' as a reservoirless system:shrug: .

No air is funneling down, the pump suction tube is 4inches under water, the surface is very calm...

I think its very strange this!. could it be powerspikes or something to do with the mains?. I only ask cause it's the same sortof sound you get sometimes when you first turn the pump on...
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