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A pivotal step in your brew day, malt crushing determines both the efficiency of your sugar extraction and the smooth progress of your lautering.
The art of this stage lies in a subtle balance: crushing the grain finely enough to release the starch, while preserving the malt husk so it can act as a natural filter.
Grain that is not crushed enough will reduce your efficiency, while an overly fine crush will turn your mash into a compact cake that is impossible to filter.
But don’t worry — this guide will give you the right tips to mill your malt properly and choose your first mill with confidence.
Mastering Malt Crushing: The Role of the Filter
The ideal crush size depends mainly on the filtration system you use in your home brewery:
- For BIAB (Brew in a Bag): Since the mesh of the bag is very tight, the risk of clogging is low. To optimise your efficiency, you can afford to crush the malt quite finely. The smaller the particles, the faster the starch becomes accessible. Just be careful not to turn it into flour.
- For All-in-One systems and traditional filters: Whether you use a false bottom, a stainless-steel braid, or an automatic basket system, avoid crushing too finely. The husk must remain as intact as possible to form a permeable filter bed. As a general rule, the kernel should be broken into 4 or 5 pieces. If lautering goes perfectly on one batch, you can try tightening your mill very slightly on the next session.
Choosing Your Equipment: Manual Mill or Electric Mill?
To achieve the perfect crush, choosing the right malt mill is essential. There are two main categories of equipment:
- The manual malt mill: Whether disc-based (cast iron) or roller-based, the manual mill is ideal for beginners, small budgets, or modest batch sizes (up to 20 litres). Roller mills offer better preservation of the grain husk. A clever brewer’s trick? Attach a power drill to the crankshaft to save physical effort on grain-heavy recipes!
- The electric malt mill: Designed for frequent brewers or those working with large volumes, the electric mill offers unmatched comfort and valuable time savings. Equipped with a robust motor, it ensures a constant rotation speed that delivers a perfectly consistent crush from the first to the last kilo of grain — with zero effort.
How to Adjust and Monitor Your Mill
Once you’ve chosen your model, you’ll need to set the gap by tightening or loosening the adjustment screws. For more detailed visual tips on crush size, feel free to check out our full article on the Rolling Beers blog: Malt Crushing.
Important during use: Due to vibrations caused by manual or electric rotation, the adjustment screws on “budget” models may naturally loosen over time. Make a habit of regularly checking the texture of your crush while milling to ensure the gap hasn’t shifted.
Rolling Beers Team Tips
If you’re unsure about the setting, it’s better to start a bit too wide than too tight: slightly lower efficiency is always easier to handle than a completely stuck lautering that ruins your brew day. Take the time to get familiar with your mill, note your settings from one batch to the next, and you’ll quickly find the signature crush that suits your setup.
Still unsure about choosing or adjusting your mill?