The pH in my second chamber is not significantly different than the first.  The difference is like 0.01.  (I run the first chamber at a target of 6.7).  I don't know if that means I'm running the effluent too quickly (60ml/min) but anything less than that and the levels start to drop, so, I don't have much wiggle room. 
 
I would take a few measurements of the pH in the first chamber (disconnect the second chamber temporarily).  Then at least you know what's happening in there without guessing from the second chamber's pH. 
		
	
		
		
		
		
			
				__________________ 
				 -- 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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