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#1
05-13-2004, 03:22 PM
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A closed loop is a means of creating current by using an external pump. So your input(s) of the pump and the output(s) of the pump are in the same body of water, hence it is a "closed" loop (as opposed to something like a sump return, which is "lifting" water and hence "not" a closed loop).
HTH 
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! 
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