Gervin GV7 Restart Yeast is a specialist yeast strain formulated specifically to re-start stuck or sluggish fermentations. Particularly effective for lager beers, it produces clean, clear results with a subtle flavour profile that won't overwhelm the existing character of your beer.
Frequently Asked Questions
- How do I know if my fermentation is stuck?
- Take two hydrometer readings 24 hours apart. If both are the same and above the expected final gravity (FG) from your kit instructions, fermentation has stalled. Common causes are temperature too low, not enough yeast, or nutrient deficiency.
- How do I use GV7 to restart fermentation?
- Warm the beer to 20–22°C first. Sprinkle GV7 directly onto the surface of the beer without stirring. Add a teaspoon of Yeast Nutrient at the same time. Leave undisturbed for 24 hours, then check for signs of activity. Fermentation usually restarts within 24–48 hours.
- Will GV7 change the flavour of my beer?
- GV7 is formulated to have a very subtle, neutral flavour profile so it doesn't significantly alter the character of your existing beer. It finishes clean and clear, which is why it's also popular for lager fermentations.
- Can I use GV7 for a normal primary fermentation?
- Yes — GV7 can be used as a primary yeast, particularly for lagers and light ales where a clean, neutral fermentation character is desired. However, for most ale styles, GV12 is the better all-rounder.
- What if GV7 doesn't restart my fermentation?
- If fermentation still won't restart after 48 hours, check your temperature (it should be 20–22°C), ensure the beer isn't infected, and try adding more Yeast Nutrient. If the beer is already at or near its expected FG, it may actually be finished — confirm with your hydrometer before assuming it's stuck.