As I cleaned my shed, I found a box that was given to me a while back (a few years).  The contents of the box include a bunch of snake oil additives, a couple containers of KENT PH adjustment powder, various test kits and two small bottles of E.S.V. B-Ionic 2-Part Calcium Buffer (#1 and #2).  Both bottles are half empty.  I can't seem to find a date on either of the bottles.  Do these stay good?
	
		
			
		
		
	
			
			 
					
				
 
 
		 
 
		