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Fermenting is a science, and a bit of an art. It requires care in a few specific things, but doing it right is not particularly complicated. We provide instructions that are accurate to the best of our knowledge, and which are based on the methods we successfully practice ourselves. There are no guarantees of success or safety with fermented foods. While properly fermented foods are not only safe, but healthy to eat, it is up to you to follow instructions to ensure safety, and to trust your eyes and nose, and don't eat things that do not look or smell like food. We offer no guarantees of success with our product. We do warrant that it is as described, and will do what we say it will, but how you use it is your choice.

Warning! This topic is NOT complicated, but it does have different parts, because some types of foods are fermented in one way, some in another way, and a few can be done in more than one way. So we’ll try to cover the basics in as simple a manner as possible.

Fermenting foods introduces healthy microbes into the food, which sometimes preserves the food for an extended period, but sometimes is done for reasons other than preservation. The microbes consist of an assortment of bacteria and yeasts. When it is done properly, the healthy ones grow faster than unhealthy ones and keep the unhealthy ones from populating significantly. For more on good and bad microbes, read this article: Good Germs, Bad Germs

Other terms commonly used for fermented foods include:

  • Cultured
  • Cured
  • Pickled
  • Brined

We do NOT advocate or provide information on making alcoholic drinks – we do provide information on not ACCIDENTALLY making such foods!

Commonly fermented foods include:

  • Sauer Kraut
  • Pickles (old fashioned brined pickles do not use vinegar)
  • Vinegar
  • Milk cultures such as kefir, buttermilk, and yogurt
  • Salsa
  • Mustard
  • Ketchup
  • Many types of condiments
  • Bread yeasts (including wild yeast made without store bought yeast)
  • Hummus and other bean ferments

Many of these are traditionally fermented foods. Most fermented foods end up with a pickled flavor, and may taste like they contain vinegar even when they do not.

Most fermented foods follow a basic set of processes and rules:

1. Use clean containers and utensils, and clean your produce with water (vegetable detergents are not helpful).

2. Prepare the food – peel, chop, crush, mix items together, etc. WARNING: If the food has spoiled bits on it, soft spots, or other signs of decay, do not use it. You need fresh food with no signs of mold or rotting, or you’ll spoil your ferment before it even gets started.

3. Either pack it into the jar so there are no air bubbles, or submerge the food in salt brine. Exception: wild sourdough yeast is simply mixed in a jar.

4. Solid foods that do not have liquid above the surface should be close fermented with a lid on the jar. Brined foods may be open or close fermented (closed fermenting may take a little more attention if you don’t use an airlock system). Vinegar and wild yeast requires open fermenting.

5. Leave plenty of headroom in the jar, so the food has room to expand. Foods will typically increase by 25-30%, but some increase as much as 50% in the fermentation process.

6. During the initial fermentation period, make sure the food stays under the surface of the liquid if it is a brined food (use something to hold it under the brine if needed – a zip bag filled with water works if you don’t have anything else the right size, though we recommend using a double layer of zip bags with a bag full of water sealed inside a second bag just in case it pops open).

7. DON’T MESS WITH IT! Leave it alone and don’t stir it, don’t open the cap, don’t repack it, just leave it alone for at least 3-5 days (or however long the recipe calls for).

Exception #1: Non-airlock close fermented containers should be vented as needed. This does NOT mean opening the top! It means loosening the lid until you hear it hiss, and tightening it back a little when it stops hissing. The top of a canning jar lid won’t pop down when pushed if it needs vented.

Exception #2: If you are making sourdough starter or Amish Cinnamon Bread starter, then you need tend to it as directed in your instructions. If you are making wild yeast, it is important to open it and stir it daily during the initial fermentation period to help with the propagation of wild yeast in the starter. That is not important once it gets going.

NOTE: During the beginning of the process, the ferment won’t have much odor, but by the second or third day, you should start to smell a vinegary, pickley smell. If it lacks that smell, after four or five days, and especially if the water has gone unevenly cloudy (iodized salt may cause a little bit of even opacity to the water, this is more clumpy looking), or if the vegetables have started to feel slimy, throw it out. This isn’t likely to happen if you follow the directions, but the best of us push the limits sometimes and find out the hard way just where they are!

8. When the food has reached the desired degree of fermentation, it may be repacked into a clean storage container with a tight lid. Make sure that you still follow the rules of working out air bubbles, and submerging brined foods in brine. The jar should be fairly full. Store the container in a cool, dark place – a refrigerator is good, or a cool root cellar.

9. During storage, DON’T FUSS WITH IT! If you need to remove some to use it, do so, but don’t mess with it a lot, and submerge the foods again, and reapply the lid, tightly.

10. Make sure you clean your hands before getting foods out, and use clean utensils. It can be really difficult to keep the kids from getting into the pickle jar with their fingers, but it helps the food last longer!

11. Use your eyes, and your nose. If something does not look or smell like food, don’t eat it. Throw it away instead. Don’t try to salvage it. Your compost will appreciate it, but your stomach probably won’t.

Some foods do require specific temperatures to incubate cultures, but most pickled foods do not. Some won’t do well in summer heat – in fact most don’t, though you can culture yogurt in the summer without an external heat source if you live in a warm climate. Most pickled items were fermented in a root cellar in previous centuries, where the temperatures were fairly cool, allowing for a long slow ferment. A root cellar is typically warmer than a fridge, but cooler than room temp, and many ferments thrive in that range. The top of the fridge provides a warmer place to culture foods that like a little extra warmth in the winter time. Pay attention to the way your recipe says to do it, and find a spot that meets the general requirements.

Fermenting foods can be a lot of fun. There’s a real thrill in biting into a pickle that started out with a few simple ingredients, and turned into something that does not taste like any of the ingredients you put in, but which is simply delicious. Fresh cultured foods are not like the embalmed grocery store versions, they are crisp and lively in flavor and texture.

So follow the rules to enjoy healthy fermented foods. And have some fun with it!

The ORIGINAL one-way valve fermenting airlock! Imitation IS the sincerest form of flattery, and we have noticed that our product has been copied by other sellers of fermenting products. Remember, if you see someone else selling a one-way valve airlock for fermenting, THEY copied US, not the other way around! Fermenta Lock is still the only original invention, handmade in the US. If it isn't orange, it isn't the original!

We invented Fermenta Lock, Fermenta Free, and the valve used for Fermenta Fido and other Fermenta Airlock products. We invented Fermenta Dunk Extender. Patents are prohibitively expensive, and designed by the government not to protect the rights of individuals, but to provide another source of revenue and control for the government and lawyers. We are good at what we do. We have endless ideas and endless creativity, and competition does not scare us. Impatient thieves do not scare us - they are too busy taking shortcuts to make a success of it anyway, and they won't want to take the effort to actually MAKE a product and fill orders.

So if you want to copy our idea, go right ahead. If you want to market and sell a competing product, you are welcome to do so, as long as you do not patent our idea - we had it first, and our posts on FaceBook announcing the invention and launch of it will prove that. This idea is officially in the public domain, placed there by us. We will NOT release supply sources, or part names unless you want to buy them - we'll be happy to sell you an instruction kit. If you buy our product, or look at the images and figure it out for yourself, good on you. Compete with us if you like, just don't screw us, and we'll get along just fine. Big companies who might want to screw us may have more money, and more lawyers than we do, but we have more to gain by suing the pants off a big company, and believe me, we will be well motivated to do so if anyone patents our idea and claims it as their own - this is a free idea. Everybody now owns it.

Published June 23, 2012

Wholesale, Export, and Manufacture of this product by other companies is an option. International distributorships are available for those wishing to export. Please email us to inquire about access to our wholesale website, or in regards to manufacturing any of our products.

Business Building Services Are Available - If you are wanting to build a business like this, where you make things in the home and sell them direct to the customer, or if you want to build a business that you can sell to other people as a complete business package, Firelight Heritage Farm is now offering Cottage Industry Services to aid small business owners in building a successful product or service business from the home. Don't know what you want to do? We can help you figure that out too (something original, and just yours, not a canned business). You get the wisdom and uniquely successful perspective and experience of people who have been business, marketing, and website professionals for more than a dozen years. For more information, visit Why copy someone else's business when you can do something uniquely you and enjoy it so much more?

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Uses of Fermenta Lock

Fermenta Lock is a compact airlock cap for mason jars, to help in making old fashioned brined pickles, and other lacto-fermented foods. Use Fermenta Lock for:

Pickles (all kinds)
Sauer Kraut
Milk Kefir
Bean Paste/Hummus
Sourdough Starter (if started with culture or yeast)
Anything which needs gas release without a lot of air circulation.

Customer Comments

“Living down in Guatemala, we have quite a lot of dampness in our houses and mold is an ongoing battle. After a long dose of antibiotics due to a parasite, I absolutely required probiotics to get my gut back in order and I know homemade sauerkraut has more probiotic content than anything else I could find here. I wasn’t able to make my beloved sauerkraut or even Kombucha in my kitchen because mold would start growing immediately on the top. Your Fermenta Locks have literally been a lifesaver for me! No more mold, and PERFECT Kraut EVERY time!!! Thank you for creating such a wonderful product!!!”

A. Kratzert

“Oh how I wish I had found you first!! Too many experts and too many bucks later I discovered your “Lock” and the sheer elegance and simplicity of your system.Thank you for your help and affordability, it makes healthy food attainable.”


“I came back to order more FermentaCaps. A wonderful innovation. I have not lost a single batch of sauerkraut since I started using the original Fermenta Locks.”


“Please continue your good work on producing such a great product. I’ve tried lots of other kinds of airlocks- the 3 piece water lock, pickle pipes, fermilid, boss pickler, and I think yours is the best design and quality. I’d like to order another 100 of them right now, but I’ll have to wait a bit. I’ve had lifelong health challenges. I’m 38 and about 20 years ago my health was so bad I didn’t feel like living most of the time. Now my health is the best it’s ever been and it wouldn’t be possible without fermented vegetables, they have made a huge improvement in my health.”


(Last names omitted to protect customer privacy.)