Ahh OK,  makes sense to me now.  
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					Originally Posted by  vic622
					 
				 
				I've got an overflow on the display (600gph), so yeah, that's happening ... 
When I built my sump, I didn't make a skimmer chamber, and wanted to make sure that I was able to get the surface layer from the 1st chamber.  
I get a fair amount of foam forming on the surface of this chamber and wanted to target it - only way I could think of was to pull from the top. 
With the water level changing with evaporation I needed a way pull without cavitating the pump and ... Voila
 
Plus it gave me a chance to sniff methylene chloride fumes for a day    
			
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