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How to Properly Sanitize Cans Before Filling

Whether you’re canning cold brew, beer, or any other beverage, proper sanitation is key to ensuring product quality and shelf life. Here’s a step-by-step guide on how to sanitize your cans like a pro, whether you're filling by hand or running a small-scale production line.

1. Start with Clean Cans

Before you even reach for sanitizer, give your cans a quick visual inspection. Look for:

  • Dust or debris
  • Dents or defects
  • Signs of moisture if they’ve been in storage

If your cans were stored uncovered or in a dusty environment, give them a quick rinse with clean water. Sanitizer is most effective on a clean surface.

2. Sanitize Using a No-Rinse Food-Grade Sanitizer

The industry standard is to use a no-rinse, food-safe sanitizer. Popular options include:

  • Star San – Acid-based, safe and effective for home or commercial use
  • Peracetic Acid (PAA) – Common in commercial breweries and cold brew operations
  • Iodophor – Iodine-based and widely used in beverage production

Recommended Method:

  • Dilute properly (e.g., Star San: 1 oz per 5 gallons of water)
  • Use a spray bottle, can rinser, or sanitizing tunnel
  • Spray the inside of each can thoroughly
  • Let them air dry for at least 1 minute—do not wipe or rinse

3. Best Practices

To avoid contamination or wasted effort, keep these tips in mind:

  • Never use bleach – It leaves residues and corrodes aluminum
  • Don’t rinse after applying no-rinse sanitizer
  • Don’t stack wet cans – This can trap moisture and lead to microbial growth
  • Only sanitize right before filling
  • Optionally sanitize can ends/lids—especially for longer shelf life
  • Minimize time between sanitizing and seaming

Scaling Up?

If you’re increasing production, automation can save time and improve consistency:

  • Use in-line can rinsers with sanitizer jets or air knives
  • Install UV light tunnels for extra sterilization
  • Purge with nitrogen right before filling to displace oxygen and reduce contamination

Have questions or want help optimizing your canning process?
Reach out to us at info@oktoberdesign.com. We're happy to help.

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