Sweet or sour?
Must is sold in either a naturally cloudy or a clear form. After pressing, it is thus either clarified (filtered) or left in its natural state. The fresh juice can only be kept for about a week, however, which is why it is generally pasteurised afterwards, i.e. heated to just under 80°C for 20 minutes. It will then keep for a year in a sealed bag-in-box container without any problems.
Did you know? Large fruit pressing plants store part of the apple juice as concentrate in order to save space and preserve it. To do this, the water and aroma substances are removed from the must. To make up the juice again, water and aroma substances are mixed in with the concentrate.