What depth of water are you running your CSC450 in ? 
 
I just got one yesterday and I'm having trouble getting it to produce some good skimate.  Right now it fills the cup about every hour. But I do have it sitting in 9 1/4 inches of water which is the max level according to the instructions.  I'm thinking I might need to try it in 7 or 8 inches of water 
		
	
		
		
		
		
		
	
		
		
	
	
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