A mash tun false bottom is a screen installed at the base of a mash tun to separate the sweet liquid wort from the grain bed during the lautering process. The wedge wire false bottom is a type of false bottom made from stainless steel wedge wire, also known as https://www.wedgewire-filter.com/news-wedge-wire-false-bottom-mahs-tun-for-beer-brewing.html