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Unread 07-15-2003, 03:27 PM   #4
MMZ_TimeLord
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Join Date: Apr 2003
Location: San Mateo, CA, USA, Earth
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Simple Green & hot water 50/50 in a closed loop with the pump only.

Vineger & hot water 50/50 in a closed loop with the pump only.

You could use something more harsh if it's only copper, but I'd try one of those two first... in that order.
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