Sanitarium bought the recipe and the operation in 1928 and today it is Australia's favourite breakfast cereal. Weet-bix is manufactured in most Australian states. In these, flake biscuits are used as a medium to carry extra ingredients with particular nutritional advantages, for example the soluble fibre of oat bran in Weet-Bix plus Oat Bran. If wheat is too moist, it can get mouldy and spoil. If it's too dry, it will break when it is being milled into flakes.
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It also helps bind flakes together to make firm biscuits. Some small amounts of unwanted materials find their way into loads of wheat. These include weed seeds, other grains and small stones. It is important to get rid of these undesirables. The more present, the harder it is to remove them.