E-Z Store & Pour Developer is conveniently packaged in easy to handle one-gallon bottles, four per case. No mixing required.Specifically formulated for long life in low volume situations, sealed gallon bottles of E-Z Store & Pour Developer have a shelf life of up to one year. Once opened, this chemical should be used within 2 weeks to minimize chemical oxidation.Ready-to-use (premixed) developer solution ideal for low volume accounts, i.e., less than 25-14x17" films processed per eight hours.