Deb, 
Something to think about- 
If you leave your flush valve open(running) then the water first goes through the sediment cartridge and then the carbon filter. 
 
So what I am getting at is that you may have run alot of water through that carbon filter in the time you left it open.  Just an idea :?  
 
Anyway, I have a Maxxima kent unit, So Ro/Di and it has a color change Di cartridge and I have had the unit for 11 months now and the color change on the Di cartridge is only 1/4 changed. 
		
	
		
		
		
		
			
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Jonathan 
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