Can I use and store the power degreaser power packs over time?
There is nothing within the product that is likely to degrade over time, so in theory the product once mixed should last at least a year, certainly as long as it would take to use up, based on average household use.
The power pack sachets will keep for years provided they are kept dry. This is crucial as they are designed to dissolve in water so must remain dry. It says on the tub that they should be handled as little as possible for this reason.