When a box of post mix is empty but is still connected to the gas should this waste gas?


No, when the box is empty everything will stop working. However if the bag in box connector is allowing air to be sucked in that means there will be an airlock in the gas pump and will keep pumping (using gas), till a new bag is connected; the pump is switched off or the gas bottle is empty, whichever happens first. Contact your tech services for a replacement.

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