Sous Vide Method: Precision Water Bath for Decarb & Infusion
How to use a sous vide immersion circulator for precision decarboxylation and infusion. The most accurate and odor-free method available for home edible-making.
Guide Notes
BatchCraft Editorial Team
Chaady Research Desk
Content is written for educational recipe-planning use and cross-checked against the calculator, recipe gallery, and process guidance already published on the site.
Updated March 13, 2026
Recipe and planning pages are designed to work with the BatchCraft calculator workflow, including serving-size assumptions, prep notes, and batch-planning helpers.
What Is the Sous Vide Method?
Sous vide (French for "under vacuum") is a precision cooking technique where food is sealed in a bag and cooked in a temperature-controlled water bath. For edible-making, this technique can be used for both decarboxylation and infusion with unmatched temperature precision — typically within ±0.5°F of the target.
A sous vide immersion circulator (such as the Anova Precision Cooker, Joule, or Inkbird) heats water and continuously circulates it around the sealed bag, ensuring perfectly even temperatures with zero hot spots. This makes it arguably the most precise decarb and infusion method available to home cooks.
Why Use Sous Vide for Edibles?
- Precision: Temperature accuracy within 0.5°F — far better than any oven or stovetop method
- Odor control: Sealed bags trap nearly 100% of volatile compounds. This is the most discreet method available.
- Consistency: Water baths have no hot spots, so every part of your material is treated identically
- Hands-off: Set the temperature and walk away. No stirring, no checking, no babysitting.
- Dual-purpose: The same setup handles both decarb and infusion, just at different temperatures and times
- Preserves terpenes: Sealed environment prevents volatile terpene compounds from escaping
A quality sous vide circulator costs $80–$200 and is useful for regular cooking as well, making it one of the best value options if you do not already own one.
Step-by-Step: Sous Vide Decarboxylation
- 1Fill a pot or container with water and attach your sous vide circulator. Set the temperature to 203°F (95°C) and allow the water to reach temperature.
- 2Break your source material into small pieces and place it in a vacuum-seal bag or a high-quality zip-lock freezer bag.
- 3If using a zip-lock bag, use the water displacement method: slowly lower the bag into the water with the top open, letting water pressure push air out, then seal just above the water line.
- 4If using a vacuum sealer, seal on a low setting to avoid crushing the material. Leave some space in the bag.
- 5Submerge the sealed bag fully in the water bath. Use a clip or weight to keep it submerged if needed.
- 6Set a timer for 90 minutes. The circulator will maintain precise temperature throughout.
- 7When the timer is up, remove the bag and place it in an ice bath for 5 minutes to stop the reaction.
- 8Open the bag. The material should be darker in color, dry to the touch, and crumbly. It is now ready for infusion.
Use only food-grade bags rated for sous vide temperatures. Standard sandwich bags can melt or leach chemicals at 200°F+. Vacuum-seal bags or thick freezer-grade zip-lock bags (like Ziploc brand freezer bags) are safe.
Step-by-Step: Sous Vide Infusion
- 1After decarbing, set your sous vide circulator to 185°F (85°C) for oils, or 160°F (71°C) for butter.
- 2Place the decarbed material and your measured carrier fat into a new vacuum-seal or zip-lock bag. Use approximately 7–14g of material per cup of carrier.
- 3Seal the bag using the same method as the decarb step (vacuum seal or water displacement).
- 4Submerge the bag in the water bath and set a timer for 4 hours. Longer infusions (up to 8 hours) may extract slightly more, but with diminishing returns after 4 hours.
- 5Every 60–90 minutes, gently massage or shake the bag to redistribute the material within the carrier. This is optional but improves extraction.
- 6When the infusion is complete, remove the bag and let it cool enough to handle safely.
- 7Cut a corner of the bag and pour the infused carrier through a fine mesh strainer or cheesecloth into a glass container.
- 8Squeeze or press the material to extract all remaining carrier. Discard the spent material.
Temperature & Time Reference
| Stage | Temperature | Duration | Notes |
|---|---|---|---|
| Decarboxylation | 203°F / 95°C | 90 min | Lower temp than oven method, but perfectly even |
| Infusion (Butter) | 160°F / 71°C | 4 hours | Low temp prevents milk solids from burning |
| Infusion (Coconut Oil) | 185°F / 85°C | 4 hours | Higher temp for better fat-soluble extraction |
| Infusion (Olive Oil) | 185°F / 85°C | 4 hours | Same as coconut oil |
| Infusion (MCT Oil) | 185°F / 85°C | 4 hours | MCT extracts efficiently at this range |
You can do both decarb and infusion in a single session by starting at 203°F for 90 minutes, then lowering the temperature to your infusion target, adding carrier fat to the bag, resealing, and continuing for another 4 hours. This saves time and keeps everything in a sealed environment.
Pros & Cons
- PRO: Most precise temperature control available to home users
- PRO: Virtually zero odor when bags are properly sealed
- PRO: No hot spots — every part of the material is treated identically
- PRO: Hands-off once set up — no stirring or monitoring required
- PRO: Dual-purpose equipment useful for regular cooking
- CON: Requires vacuum sealer or compatible zip-lock bags
- CON: Longer total process time than oven or dedicated devices
- CON: Small learning curve for bag sealing and water displacement technique
- CON: Uses more water and energy for long infusion runs
Efficiency & Expected Results
Sous vide consistently achieves 90–98% decarboxylation efficiency and 75–85% infusion efficiency. The sealed environment preserves volatile compounds that would be lost in open-air methods, often resulting in a more flavorful and aromatic final product.
When using the sous vide method with BatchCraft Calculator, select the "Optimistic" efficiency preset (95% decarb efficiency). The precision temperature control and sealed environment justify the higher efficiency estimate.
Common Mistakes
- Using bags not rated for sous vide temperatures — standard sandwich bags can melt
- Not removing enough air from bags — air pockets cause bags to float and create uneven heating
- Setting decarb temperature too low — below 190°F the reaction is extremely slow
- Not allowing the water to reach target temperature before submerging bags
- Cutting the bag open while contents are still hot — risk of burns and steam release
- Re-using bags that have developed micro-tears — water leaks in and ruins the batch
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