Clearer wort, clearer beer. A few millilitres of Biersol at the end of the boil help the hot-break proteins separate out, so a brighter beer goes into the fermenter.
Silica sol · 3–5 ml per 10 L · End of the boil · Also fines young beer · Keep frost-free · 100 ml
What it does in your beer
Biersol is a silica sol: colloidal silicon dioxide in a slightly alkaline water solution. Dosed at the end of the boil, it improves the clarification of proteins in the wort — the so-called hot trub — and contributes to a clearer beer.
Brewferm also lists it as a clarifier for young beer, so it has a second job after the boil.
At a glance
| Brand | Brewferm (Belgium) |
| Type | Silica sol — wort and beer clarifier |
| Composition | Colloidal silicon dioxide in a slightly alkaline aqueous solution, approx. 30 % SiO₂ |
| pH | Approx. 8.9–9.5 |
| Dosage | 3–5 ml per 10 L |
| When to add | End of the boil; can also fine young beer |
| Pack size | 100 ml |
| Storage | Frost-free, protected from light |
How much for a 20 L batch
3–5 ml per 10 L means 6–10 ml for 20 L. One 100 ml bottle covers 10 batches at the top dose, or 16 at the bottom one.
How to use
- Measure 3–5 ml for every 10 L of wort — a small syringe makes this easy.
- Add it at the end of the boil.
- Clearing a young beer instead? Brewferm lists that use too; the only dose it publishes is 3–5 ml per 10 L.
- Keep it in its original bottle: the safety data sheet advises polyolefin containers and warns against steel.
Pairs well with
Brewing a pale lager where every bit of clarity shows? Try it with Czech Pilsner Malt and SafLager W34/70.
Prefer a tablet in the kettle? Protafloc is our carrageenan-based kettle fining.
Storage & shelf life
- Store frost-free and away from light.
- Keep the bottle closed and in its original container.
Food information
- Name: Biersol — silica sol for wort and beer clarification
- Ingredients: colloidal silicon dioxide in a slightly alkaline water solution
- Allergens: none stated by the manufacturer
- Net quantity: 100 ml
- Storage: frost-free, protected from light
Good to know
- Brewferm declares Biersol appropriate for food use.
- Not classified as hazardous in its safety data sheet. If it gets in your eyes, flush thoroughly with running water and seek medical advice.
- Don't let it freeze: "Storage frost-free!" is the one line Brewferm ends with an exclamation mark.
- Brewing ingredients reach you from our partner warehouse in the Czech Republic, in their own parcel.
FAQ
When do I add Biersol?
At the end of the boil, 3–5 ml per 10 L.
How much for 20 L?
6–10 ml.
Can I use it in the fermenter?
Brewferm says it can also be used as a clarifier in young beers.
How should I store it?
Frost-free, away from light, in the original bottle.