When all-grain brewing using large quantities of wheat, oats or other coarse grains, the filter bed can become easily clogged, which makes lautering very difficult. BREWFERM steam-sterilised rice hulls are the ideal solution: these rice hulls do not affect the flavour at all and can be used to improve the lautering of the mash:
When to use: whenever you expect problems lautering the mash:
- When using a lot of wheat malt (more than 50%) – wheat malt has no husks, which makes lautering difficult.
- When using a lot of unmalted grain (flakes)
- When using rye (rye has no husks either, but can lead to a type of "gel" forming on the grain bed). The filter can become blocked, with no more liquid able to pass through the grain bed (a.k.a. a stuck sparge). You can use Brewferm rice hulls to prevent this from happening. They make the filter bed less compact, allowing liquids to penetrate more easily.
Use: max. 5% adjunct. The simplest option is to add the rice hulls to the mash (especially if using a system that circulates the wort (Braumeister, Grainfather, Brew Monk etc.).