Industry
Part of What fermentation supplies are for, and which ones you can skip: the parts worth your time
Fermentation supplies businesses may need for canning
Fermentation supplies businesses may need include pH meters, buffers, batch records and testing; home cooks can follow tested recipes and use basic equipment.
What to take away
- The fermentation supplies businesses may need include measurement tools. A home kitchen buys a tested recipe and follows it exactly.
- pH decides the canner4.6 or lower goes in a boiling water canner, above 4.6 needs a pressure canner.
- Botulinum spores survive boiling water. Only pressure canning reaches the 240 to 250 F needed to destroy them.
- Home canners do not need their products lab tested. Sellers often do, and the requirement comes from the inspector, not the recipe.
The canning threshold for shelf-stable products
For fermented pickles or other foods intended for shelf-stable canning, Clemson Extension's factsheet on canning foods and the pH factor states the rule that separates the two canners. Acid foods such as fruits and pickles with a pH of 4.6 or lower may be canned in a water bath canner. Low-acid foods such as vegetables and meats with a pH above 4.6 must be processed in a pressure canner.
pH 4.6 divides the canners
Water bath canner
- Foods
- Fruits, pickles
- pH
- 4.6 or lower
- Temperature
- 212 F boiling
- Botulinum spores
- Survive
Pressure canner
- Foods
- Vegetables, meats
- pH
- Above 4.6
- Temperature
- 240 to 250 F
- Botulinum spores
- Destroyed
Clostridium botulinum spores survive boiling water at 212 F and can grow in a sealed jar of low-acid food, changing into cells that produce the toxin. A pressure canner is used to reach 240 to 250 F and destroy them.
The same factsheet makes a point that saves home cooks money: you do not need to know the pH of a food, but you must use a tested recipe based on it. Alongside pH, heat transfer, particle size, viscosity, and container size all shape the correct process.
What a commercial fermentation operation may add
- A calibrated pH meter, plus buffer solutions and a calibration log
- Batch records tying each lot to a recipe, a date, and a reading
- A relationship with a processing authority for any acidified product
- Lab testing where the inspector requires it
- Packaging and labeling equipment suited to the product and applicable state and federal requirements
- Food-grade fermentation tanks or large crocks sized for the batch; a home cook may use a jar or crock
- A temperature-controlled fermentation space and temperature data loggers; home cooks can monitor a batch without commercial logging equipment
- Brine measurement tools such as a salinometer, brine hydrometer, or refractometer; home cooks can weigh salt and water according to a tested recipe
- A titratable acidity test kit when the process calls for acidity testing beyond pH
- Starter cultures or inoculants when the product's process uses them
- A bottle filler, capper, or label printer when the production scale and package require them
Concrete examples: Hanna Instruments HI98107 and Thermo Scientific Orion Star A211 pH meters, with Hanna HI7004, HI7007, and HI7010 buffers at pH 4.01, 7.00, and 10.01. Lab-grade meters commonly resolve to 0.01 pH and 0.001 aw. Aqualab 4TE and Novasina LabMaster water activity meters cover water activity, often checked with 0.50 aw, 0.76 aw, and 0.92 aw standards.
Named labs include Eurofins, Mérieux NutriSciences, and Certified Laboratories. The rules are FDA 21 CFR 114 for acidified foods and 21 CFR 113 for low-acid canned foods. Labeling follows FDA 21 CFR 101 and the state program. A processing authority often holds a Better Process Control School certificate.
Penn State Extension answers the testing question directly: producers selling canned foods may be required by their inspector to have products tested for pH and sometimes water activity, and commercial laboratories do that work. For home canning for your own family, testing is not recommended; use research-tested recipes instead.
Canning seals are separate from active fermentation
For fermented products that will be canned for shelf storage, Penn State's guidance on ensuring a good seal explains the canning step. A strong vacuum seal can only be achieved by properly processing the food in a pressure, boiling water, or atmospheric steam canner. Jars must be free of nicks and cracks on the sealing surface, lids free of dents and scratches.
Headspace by food type
- 1/4 inchjams and jellies
- 1/2 inchtomatoes, fruit, pickles
- 1 inchvegetables and meat
- 1-1/4 inchchicken
Headspace is usually 1/4 inch for jams and jellies, 1/2 inch for tomatoes, fruit, and pickles, 1 inch for vegetables and meat, and 1-1/4 inch for chicken. Screw bands go on fingertip tight: too tight and air cannot vent so lids buckle, too loose and the vacuum is weak.
Jars that did not seal are reprocessed within 24 hours with new lids for the original time, or frozen, or refrigerated and used.
Why commercial and home lists differ
A business has to prove safety to somebody else. A home cook can use a tested recipe and the equipment it calls for. Commercial proof requires meters, records, and time; home fermentation still benefits from a scale and the discipline to follow a recipe without substitutions.
Our supply guide covers the home list, and the piece on rules a business follows covers the regulatory side of the same divide.
