Thread: Metal halide or T5
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  #17  
Old 01/01/2008, 11:41 AM
returnofsid returnofsid is offline
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Join Date: May 2006
Location: Spokane, WA
Posts: 525
It's a device to automatically top off your tank or sump with freshwater to replace evaporation. You can go hi-tech or a simple DIY direction.