<p>I used to use D-76 diluted 1+1, buthave just recently have tried a different approach.<br>
I make up the 1 U.S Gallon (3.78 litres) bag to make 4 litres of stock and decant it into four 1 litre bottles.<br>
After one roll of film has been processed, I pour the developer back into it's storage bottle for reuse, but strictly for "one-shot" use from then on.<br>
I think I would exactly the same with Xtol.</p>