Industries · Craft
Poly for the water. Stainless for the product.
Craft producers use a lot of totes, and very little of what goes in them is finished product. Liquor, sparge water, slurry, glycol, cleaning chemistry — the unglamorous fluid logistics of a brewhouse is exactly what a food-grade IBC suits, and a stainless vessel is what the spirit goes in.
The short answer
Documented food-grade poly for cold liquor, mash and sparge water, spent grain slurry, trub and yeast handling. Grade A/B reconditioned for glycol loops and cleaning chemistry. Stainless 304 or 316L for hot liquor, high-proof spirit, hot fill and anything under CIP. Rinse slurry units promptly — soured grain needs an alkaline wash.
Applications
What goes in what.
| Application | Container | Gasket | Size | Notes |
|---|---|---|---|---|
| Cold liquor storage | Food grade poly | EPDM | 275 / 330 gal | Insulate if it sits in a warm room |
| Hot liquor buffering | Stainless 304 | EPDM or silicone | Stainless, various | Above the poly tote's rated temperature — do not use poly |
| Mash and sparge water | Food grade poly | EPDM | 275 gal | Straightforward; the workhorse application |
| Spent grain slurry | Food grade poly | EPDM | 275 / 330 gal | 3" discharge and a tilting stand; rinse promptly |
| Trub and yeast handling | Food grade poly | EPDM | Small format | Small format is easier to move and to clean |
| Glycol expansion / top-up | Reconditioned A or B | EPDM | 275 gal | No need for food grade; excellent poly application |
| Caustic and acid CIP chemistry | Reconditioned A | EPDM | 220 / 275 gal | Label unmistakably; dedicate the unit |
| Wort transfer (contract brewing) | Stainless or new poly | EPDM | 275 gal / stainless | Temperature and sanitation drive the choice |
| High-proof spirit | Stainless 304 | PTFE or Viton | Stainless, various | Usually a stainless application. Also a regulatory one. |
| Barrel-ageing top-up stock | Stainless | PTFE | Stainless, various | Extractables matter over long holds |
Spent grain, properly handled
Spent grain is the application where totes most obviously beat everything else, and also the one where they most often get ruined.
A full 275-gallon tote of wet spent grain weighs roughly 2,500 lb, moves on a forklift in one lift, and can be handed to a farmer whole. Compared with shovelling into drums or wheeling barrows, it transforms the job. Fit a 3-inch discharge if you will be gravity-emptying and a tilting stand if you will not.
The failure is leaving it. Grain sours quickly in warm weather, and soured residue dries onto the wall into something that needs an alkaline wash rather than a rinse. Rinse the unit immediately on emptying, every time, and the tote can stay in food service for a long time. Skip it a few times and you have an industrial-grade tote.
Glycol loops
Propylene glycol in a reconditioned Grade B tote is one of the most sensible purchases a small brewery can make. It gives you a top-up reservoir, an expansion buffer and somewhere to dump a loop into when you need to service a chiller, for a fraction of what a purpose-built tank usually costs.
Where stainless stops being optional
Three thresholds move a craft producer from poly to stainless, and each is closer to a hard line than a preference.
Hot liquids
HDPE softens as it heats. Poly totes carry a maximum fill temperature from the manufacturer, and above it the cage stops supporting the bottle the way it was designed to. Hot liquor is a stainless application.
High-proof ethanol
Long contact between concentrated spirit and polyethylene raises questions about extractables and flavour carry-over. For high-proof product on a hold longer than a transfer, most producers choose stainless. Check compatibility data and current regulations for your product.
Clean-in-place cycles
A poly tote is not designed for repeated hot caustic CIP. It will survive some, and then one day it will not. A 316L vessel with a spray ball is built for exactly this duty.
Brewhouse reference
Volumes, weights and the container for each.
An example sized against a 20 bbl brewhouse. Scale to your own volumes; the container recommendations do not change with size, only the count does.
| Application | Per brew | Approx. SG | Container | Format | Gasket |
|---|---|---|---|---|---|
| Cold liquor storage | 620 gal | 1.00 | Food grade poly | 2 × 330 | EPDM |
| Hot liquor buffering | 620 gal | 1.00 | Stainless 304 | Stainless, sized to suit | EPDM or silicone |
| Mash water | 310 gal | 1.00 | Food grade poly | 1 × 330 | EPDM |
| Sparge water | 400 gal | 1.00 | Food grade poly | 2 × 275 | EPDM |
| Spent grain slurry | 540 gal | 1.05 | Food grade poly, 3 in outlet | 2 × 275 | EPDM |
| Trub and yeast | 40 gal | 1.02 | Food grade poly | 1 small format | EPDM |
| Glycol expansion | 120 gal | 1.04 | Reconditioned A or B | 1 × 275 | EPDM |
| CIP caustic | 80 gal | 1.20 | Reconditioned A, dedicated | 1 × 220 | EPDM |
| CIP acid | 80 gal | 1.10 | Reconditioned A, dedicated | 1 × 220 | Viton |
| Wort transfer, contract | 620 gal | 1.05 | Stainless or new poly | 2 × 330 | EPDM |
| Spirit, high proof | — | 0.82 | Stainless 304 | Stainless | PTFE or Viton |
| Barrel top-up stock | — | 0.90 | Stainless | Stainless | PTFE |
Spent grain
The souring clock, and what it costs to ignore.
Totes are transformative for grain handling and brewers ruin them by leaving them too long. The mechanism is worth understanding rather than just following. Timings below are rough and run faster in warm weather.
| Elapsed, warm room | State | Wall condition | Cleaning needed |
|---|---|---|---|
| First few hours | Warm, sweet, fluid | Rinses with cold water | Quick rinse |
| Later the same day | Souring; pH falling | Rinses with warm water | Warm rinse |
| Up to a day | Sour; surface film forming | Needs agitation | Warm rinse, agitated |
| One to two days | Sour, gassing, film adhering | Needs alkaline chemistry | Caustic pass |
| Several days | Film drying and hardening | Needs hot caustic | Caustic, possibly two passes |
| Longer | Hardened, varnish-like | May not come clean | Two caustic passes, may fail |
If the farmer takes the tote
This is where the habit breaks down, because the unit leaves full and returns some days later. In order of how well they work: rinse-on-return as a condition of the arrangement; a dedicated industrial-grade grain fleet that never goes back to food service; swapping units so no tote sits full more than a day; or budgeting for the caustic.
The second option is the one most people resist and the one we would suggest first. An inexpensive Grade C reconditioned tote for grain stops you ruining a documented food-grade unit that cost considerably more.
Sizing by brewhouse
How many containers a brewery might need.
A rough starting point for a full production week. Spent grain is the line that drives the count, because it turns over fastest and cannot wait.
| Brewhouse | Brews/week | Liquor & water | Spent grain | Glycol & CIP | Total fleet |
|---|---|---|---|---|---|
| 3 bbl nano | 3 | 2 × 275 | 2 × 275 | 1 × 275 | 5 units |
| 7 bbl | 4 | 3 × 275 | 3 × 275 | 2 × 275 | 8 units |
| 10 bbl | 5 | 4 × 330 | 4 × 275 | 2 × 275 | 10 units |
| 20 bbl | 5 | 6 × 330 | 6 × 275 | 3 × 275 | 15 units |
| 30 bbl | 6 | 8 × 330 | 9 × 275 | 3 × 275 | 20 units |
| 50 bbl | 6 | 12 × 330 | 14 × 275 | 4 × 275 | 30 units |
| Distillery, 500 gal still | 4 | 3 × 330 | 4 × 275 | 2 × 275 | 9 units + stainless |
Cleaning
A brewery-specific wash schedule.
What to do yourself and what to send out to a reconditioner. Most of this is within reach of a brewhouse that already owns a CIP pump.
| Container | In-house | Frequency | Send out | Frequency |
|---|---|---|---|---|
| Cold liquor | Hot caustic CIP, rinse | Regularly, per your plan | Full wash and test | Periodically |
| Sparge and mash water | Hot caustic CIP, rinse | Regularly, per your plan | Full wash and test | Periodically |
| Spent grain | Water rinse at emptying | Every use | Caustic wash | As residue builds |
| Trub and yeast | Caustic CIP, acid rinse | Every use | Full wash | Periodically |
| Glycol | Nothing | — | Wash on fluid change | At fluid change |
| CIP caustic storage | Nothing | — | Wash on retirement | End of life |
| CIP acid storage | Nothing | — | Wash on retirement | End of life |
| Wort transfer | Hot caustic CIP, sanitise | Every use | Full wash and swab | Per your plan |
Brewing and distilling questions
Can I store beer or spirit in a poly IBC tote?
For short-term holding of beer or low-proof product, a documented food-grade poly tote is workable and widely used. For high-proof spirit and long holds, many distillers prefer stainless: extractables and flavour carry-over become a real question over extended contact, and your regulator and your palate will both have opinions. Ask the supplier for food-contact documentation and check current regulations. As a rule of thumb, poly is for water, wort transfer, slurry and glycol; stainless is for product.
What do breweries actually use totes for?
Cold liquor storage, hot liquor buffering (in stainless), mash and sparge water, spent grain slurry to a farm, trub and yeast handling, cleaning chemical storage, glycol expansion and holding, and hauling wort between facilities under contract brewing arrangements. Very little of that list is finished product, which is why documented food-grade poly covers most brewery needs.
Are IBC totes good for spent grain?
Very. Spent grain slurry is heavy, wet, sours fast and is miserable to move in anything else. A food-grade tote with a 3-inch discharge and a tilting stand handles it well, and a farmer with a forklift can take the whole unit. Rinse promptly — soured grain residue is one of the harder things to clear, and it will need an alkaline wash rather than a rinse.
Can I use a tote for glycol?
Yes, and it is one of the best poly applications there is. Propylene glycol is compatible with HDPE and EPDM, and a 275-gallon tote makes a convenient expansion and top-up reservoir for a chiller loop. A Grade A or B reconditioned unit is usually enough; there is no reason to buy food grade for a glycol loop that never touches product. Check the SDS for your glycol and inhibitor package.