Fermentis SafŒno™ BC S103

SafŒno™ BC S103 Wine Yeast

SafŒno™ BC S103 is a highly robust wine yeast selected for its exceptional fermentation strength, outstanding alcohol tolerance, and ability to perform under challenging winemaking conditions. Whether you're fermenting high-gravity musts, working with highly clarified juices, or recovering a stuck fermentation, BC S103 delivers reliable and consistent results.
With alcohol tolerance up to 18% ABV, excellent fructose utilisation, and very low nutrient requirements, this strain is one of the most dependable choices available for difficult fermentations and secondary fermentation applications.
It is also widely used for sparkling wine production and fermentation restarts where reliability is critical.

Quick Overview

• Specialist yeast for difficult fermentations
• Alcohol tolerance up to 18% ABV
• Excellent for stuck fermentation recovery
• Very fast fermentation kinetics
• Exceptional fructose utilisation
• Performs well in high SO₂ environments
• Suitable for white, rosé, and red wines
• Ideal for sparkling wine secondary fermentation

Product Profile
Product Type: Active Dry Wine Yeast
Strain: SafŒno™ BC S103
Suitable For: White, Rosé & Red Wines
Alcohol Tolerance: Up to 18% ABV
Fermentation Temperature: 10–30°C
Fermentation Speed: Very Fast
Fructose Assimilation: Excellent
Nitrogen Requirements: Very Low
Volatile Acidity Production: Low
SO₂ Tolerance: High
Suitable For Restarting Fermentations: Yes

What Makes BC S103 Special?
Most wine yeasts are selected primarily for aroma production or varietal expression.
SafŒno™ BC S103 is different.
This strain is designed to provide:

• Fermentation security
• High alcohol tolerance
• Reliable completion of fermentation
• Excellent fructose consumption
• Performance under stressful conditions
• Stuck fermentation recovery

When other yeast strains struggle, BC S103 continues to perform.

Ideal Applications
SafŒno™ BC S103 is particularly suited for:

• Difficult Fermentations
• High sugar musts
• High alcohol potential wines
• Highly clarified musts
• High SO₂ conditions
• Nutrient-deficient fermentations
• Fermentation Restart

Ideal for:

• Stuck fermentations
• Sluggish fermentations
• Incomplete fermentations
• Secondary Fermentation

Suitable for:

• Bottle-conditioned sparkling wines
• Traditional method sparkling wine production
• Tank-method sparkling wines
• Prise de mousse applications

Fermentation Characteristics
SafŒno™ BC S103 offers:

• Excellent implantation ability
• Very fast fermentation speed
• Strong fermentation security
• Excellent fructose utilisation
• Low volatile acidity production
• Reliable completion of fermentation

This makes it one of the most dependable wine yeast strains available.

Aroma & Flavour Contribution
Unlike highly aromatic wine yeast strains, BC S103 is designed primarily for fermentation performance.
It generally produces:

• Neutral fermentation profile
• Clean flavour contribution
• Limited aroma interference
• Good varietal preservation

At cooler fermentation temperatures and with good nutrition management, the strain may contribute subtle fruity ester notes.

Home Winemaking Dosage
Standard Wine Fermentation
Use:

• 0.2g per litre
• 2g per 10 litres
• 4g per 20 litres
• 4.6g per 23 litres
• 5g per 25 litres

For most home winemaking batches between 20–25 litres, approximately 5g of yeast is recommended.

Stuck Fermentation Recovery
Recommended restart dosage:

• 0.3–0.4g per litre
• 3–4g per 10 litres
• 6–8g per 20 litres
• 7–9g per 23 litres
• 8–10g per 25 litres

Higher pitching rates help establish a healthy yeast population in challenging conditions.

How To Use
Direct Pitch Method
SafŒno™ BC S103 can be pitched directly into the must.

• Sprinkle the yeast evenly into the must
• Mix thoroughly
• Ensure good distribution throughout the batch
• Ferment within the recommended temperature range

Rehydration Method
For traditional yeast preparation:

• Rehydrate in 10 times its weight of water
• Use clean water between 15–37°C
• Leave for approximately 20 minutes
• Stir gently
• Add to the must and homogenise thoroughly

Fermentation Guidance
For best performance:

• Ferment between 10–30°C
• Ensure adequate oxygenation during initial fermentation
• Monitor nutrient levels
• Maintain healthy fermentation conditions
• Use higher pitching rates when restarting fermentations

BC S103's low nutrient requirements make it particularly useful where yeast nutrition may be limited.

Perfect For Winemakers Who

• Produce high-alcohol wines
• Need fermentation security
• Have experienced stuck fermentations
• Make sparkling wines
• Work with difficult must conditions
• Want a reliable rescue yeast

Frequently Asked Questions
What is BC S103 best known for?
Its exceptional fermentation reliability, high alcohol tolerance, and ability to restart stuck fermentations.

Can this yeast restart a stuck fermentation?
Yes. BC S103 is specifically recommended for fermentation restart applications due to its alcohol tolerance and strong implantation ability.

What alcohol level can it achieve?
SafŒno™ BC S103 can ferment wines up to approximately 18% ABV under suitable conditions.

Is it suitable for sparkling wine production?
Yes. It is an excellent choice for bottle conditioning, traditional method sparkling wines, and tank fermentation sparkling wines.

Does it produce strong fruity aromas?
No. BC S103 is generally considered a neutral strain focused on fermentation performance rather than aroma production.

Can I use it for home winemaking?
Absolutely. It performs exceptionally well in both commercial wineries and home winemaking batches.

Why Choose SafŒno™ BC S103?
SafŒno™ BC S103 is one of the most dependable wine yeast strains available for challenging fermentations.
Whether you're producing high-alcohol wines, recovering a stuck fermentation, or carrying out secondary fermentation for sparkling wines, this strain offers outstanding reliability, fermentation security, and technical performance.