I think you need to provide more information on what you do. If it's for occasional rolls of 35mm or 120 I don't see any advantage of storing Xtol at working strength. Aside from a much shorter developer life, you'd have to use a larger jug, or multiple jugs, to store that much solution. And I don't see having Xtol diluted already as much of a convenience gain. If convenience is important I'd suggest switching to one of the liquid 1-shot developers such as Ilfosol, DD-X or TMAX that don't require mixing a powder. However, if you're developing 4x5 or other large amounts of film and going through a pack of developer in a day or two, then it might be fine to store Xtol diluted ready-to- use.(posted 8303 days ago)