Most photo chemicals don't like low temperatures because the constituents (sp?) come out of solution. Worse, they don't always redissolve when the solution is warmed. The best you can do is probably to divide the batch into several completely full glass bottles. Agree that 5l is vastly more than some of could use in a reasonable time, especially when diluted. OTOH, they don't recommend diluting it anymore, so maybe there is some twisted logic in discontinuing the 1l packs.(posted 8390 days ago)