Yes, the developer is reused, but some techniques, specially in high contrast emulsion are better if you include the restraning in the developer instead of the emulsion. So this might require to have 4 or 5 bottles with different concentration of restraining in it. As you can imagine if you are using 1 gal developer per 12x20 sheet then 4 or 5 gallons of PO at 30% can become a very expensive proposition, I am thinking if I can do a 10% solution the this thecnique would be great and not so expensive.