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			 Sold!  Thanks very much.    
		
	
		
		
		
		
			Steve, I didn't use it long enough to form a really solid understanding, but, it seemed to work OK. I think it is at the very least comparable to a downflow. If anything, perhaps a little more efficient on account that part of the media bed gets fluidized (and prone to less clogging over time). That said, I don't know if there are any long-term significant differences. One nice thing is you don't need a recirc line for the CO2 at the top, it never gets a chance to accumulate. 
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	-- 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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