The company for the production of casing soil is in Milsbeek. Casing soil is a mixture of black peat, peat, white peat (the upper metre of fresh peat), marl and betacal (spent lime). It serves as a water buffer so the mycelium can start forming mushrooms. Casing soil has the quality mark RHP. A shovel deposits various qualities of black peat and peat into four containers in the factory. Betacal, or spent lime, is a residual product from the sugar beet industry and is deposited in a separate container. The different varieties of peat, the spent lime and marl, if desired, are mixed, filtered and moistened according to a pre-set prescription in an especially developed mixing line. A tripper stores the basic mixture in bulk. Now a micro-balance can grow between peat and spent lime. A shovel picks up the basic mixture from the storage and takes it to the delivery line. A loading master determines the dosage of water before the casing soil is loaded into the truck. The casing soil can be treated in the loading machine with 0.5 litre of formalin (in winter 0.25 litre) to kill any competitive moulds or eel worms. A grower can order different qualities of casing soil from CNC with variations in moisture content, peat percentage and addition of marl.