If you have a stuck mash - Stuck mash; wort will not flow through the grain. to test this stop the pump and see if the wort level on top of the grain bed drops. if it does not move then this is a 'stuck mash'. ...

A milling increases the surface area of the grain, making the starch more accessible and separates the seed from the husk. Crushing your grain is an important part of preparing your malt for the mashing process regardles...