The Reliable Mash at Homebrew Scale
The Reliable Mash is the real thing: a 100% sorghum malt enzyme mash we ran commercially for years. The protocol page owns the controlling values. This page answers the question that page can't: what does it look like in a 10-gallon kettle in a garage?
The batch this assumes
A 5-gallon batch from 10 lb (4.5 kg) sorghum malt. Scale everything below proportionally for a different grain bill — the doses are per-pound for exactly that reason.
The numbers, translated
| Stage | Target | Time | Additions for 10 lb malt |
|---|---|---|---|
| Liquefy | 190°F (88°C) | 60 min | ~3.1 gal (11.8 L) strike water at 2.6 L/kg; 20 mL Termamyl SC DS in the water before the grain |
| Convert | 145°F (63°C) | 45 min | Cold water to hit temperature (~1.5–2 gal); 15 mL Ondea Pro + 7.5 mL Termamyl SC DS |
| Finish | 145°F (63°C) | 10 min | 7.5 mL Amylase AG 300L |
| Mash out | 180°F (82°C) | 10 min | ~0.5 lb rice hulls, mixed 5–10 min before transfer |
Dose basis: Termamyl 2 mL/lb at mash-in and 0.75 mL/lb at coolback; Ondea Pro 1.5 mL/lb; Amylase AG 300L 0.75 mL/lb. Water 2.2–3.0 L/kg initial — the range production actually ran.
Our doses run high, and you should know that
Set our rates beside the community reference the Zero Tolerance Gluten Free Homebrew Club maintains, and the gap is not subtle:
| Enzyme | Community range (mL/lb) | This protocol | Where we sit |
|---|---|---|---|
| Termamyl | 0.227 – 0.363 | 2.0 at mash-in | ~5.5× their maximum |
| Ondea Pro | 0.181 – 1.134 | 1.5 | Above their maximum |
| AMG 300L | 0.227 – 1.588 | 0.75 | Comfortably mid-range |
This is deliberate, not a typo. The practice is documented in our own records: a 2019 note on methodology describes taking the supplier's stated cereal-cooker rate and doubling it — "stated as 0.4–0.8 kg of enzymes per MT of malt, I use 1.6 kg" — and doubling the mash rate for the glucoamylase as well. These are production numbers from a brewery that valued a guaranteed conversion over an optimised enzyme bill.
Three things to weigh before you copy them:
- Product identity matters. The community table lists Termamyl L; this protocol runs Termamyl SC DS. Same family, not necessarily the same activity per mL. Some of that 5.5× may be product, not philosophy — check your own product's datasheet before assuming either number transfers.
- Enzymes cost money, and at homebrew scale that bites. A commercial brewery dosing generously is buying insurance against a lost 75-barrel batch. On 10 lb of grain, the arithmetic is different and the downside is a disappointing Saturday.
- Over-dosing is not free. A glucoamylase that outlives its welcome keeps working through the lauter and can quietly over-attenuate the wort — the mash-out step exists partly to stop that. See External Enzymes.
What we would actually suggest: run the published rates once so you have a known-good reference batch, then step down deliberately and record what happens. That is Ask 6 — how far can enzyme doses come down? — nobody has published where the floor is on sorghum malt, and a homebrewer with a notebook is exactly who could find it.
Scale it to your batch
The table above assumes 10 lb. Enter your actual grain weight and get every dose and volume scaled — same published rates, your numbers, printable:
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The three things that decide whether this works
1. Enzyme in the water before the grain. Heat your full strike volume to 190°F, dose the Termamyl, get the mash moving, then add malt slowly. Dumping grain into hot water without active enzyme is how you get a clumped, gelatinized brick. This is the single most important sentence on this page.
2. Stir continuously. Production had a motorized agitator; you have arms or a pump. Sorghum starch gelatinizes hot and thickens fast, and unstirred mash means scorching, uneven conversion, and a stuck runoff. This is the biggest reason a recirculating system earns its price — see Equipment for the Process.
3. Hit 180°F at mash-out. The finishing glucoamylase survives lower temperatures and keeps drying your wort during a slow homebrew lauter — and homebrew lauters are slow. If your beer finishes thinner than the numbers predicted, this is the first suspect.
What breaks at small scale
- Thermal mass. A 10-gallon kettle loses heat far faster than a 40-barrel tun. Insulate, or plan to fire the burner during holds — and measure the mash, not the setpoint.
- Enzyme sourcing. These are commercial products in liter jugs. Homebrew-scale suppliers repackage equivalents; if you substitute, match the enzyme class (heat-stable alpha-amylase for liquefaction, a brewing blend for conversion, glucoamylase for finishing) and follow the vendor's dose, not ours. Record what you used — that's the data.
- Cooling for the coolback. Production added measured cold water. At home, pre-measure your coolback water and chill it; hitting 145°F by guesswork wrecks the ratio you just calculated.
- Runoff. Sorghum has no husk. Rice hulls at mash-out are not optional at this scale unless you're brewing in a bag.
What we want to know
This translation has never been validated as a homebrew protocol — it's arithmetic on a production process, and arithmetic isn't a brew day. If you run it, tell us: your efficiency, mash behavior, runoff time, gravity, fermentation curve, and what you'd change. Contradictions are the most useful reports we can get.
Related
- The Reliable Mash — the controlling production values
- Why the 190°F Baseline Exists
- The Sugar Bible — why the finishing enzyme decides your beer's body
- Equipment for the Process