Really sorry to hear things haven't improved Adam. Can't imagine loss on that scale.
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					Originally Posted by  hfp75
					 
				 
				I sympathize for your situation!! 
 
I tried to save few bucks and used HC-GFO and with a Hanna tester I was able to prove that the same levels of PO4 that went in to that reactor also came out!!!  I have switched back to Rowa and we are back on track with total success!! 
 
Sometimes the name brands cost more but they seem to be predictable.... 
			
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 HC-GFO from where?
I doubt properly working gfo knocks the levels down noticeably with one pass. I always thought it would take a small amount out (too small a change to detect) but it's the continual running of water through it that brings the overall level down in a measurable manner over time?