I am growing my spouts, Taiwan its dry with that heat, or humid, but I change the water, often. It peeling, that is the things with the mug beans, I have to plung them one by one. Technically you don't need to.

 細菌的溫床

That is just what I believe....the bacteria warm bed. Chinese says....so I soak them and pick them, wash them. Take time, but they grow faster, if you constantly standing on that kitchen counter.