Is Metal Bad for Kombucha?
Have you wondered about using metal when brewing kombucha? Well, let us explain.

A lot of content out there that will tell you DON’T USE METAL while brewing kombucha, you’ll kill your SCOBY! But is it true though? Not really. That’s only a broad assumption that all metals are the same and that all metals will instantly leach chemicals into your brew. The reality of using metal in your kombucha brew isn’t so black and white, so let’s discuss.
Kombucha and Metal
When Would Metal Come in Contact with your Kombucha?
- Metal Spoon Contact with Kombucha: This is the most common way that metal comes in contact with kombucha and is often recommended to avoid altogether. However, using a metal spoon to stir in your brew or pull out your SCOBY is 100% okay, your kombucha culture will be just fine.
- Metal Valve or Spigot Contact with Kombucha: Many homebrewers like using brewing vessels equipped with a spigot. These shut off valves on the bottom make it easier to harvest kombucha. If you’re looking to buy one like this, pay attention to the valve because they are often come with cheap plastic spigots.
- Knife of Scissor Contact with Kombucha: To cut up a SCOBY, feel free to use regular ol’ scissors or a knife. Neither will cause any long term harm.
- Metal Brewing Vessel or Fermenter: This is less common for home brewing because glass makes a great option when you’re brewing a gallon or two. However, glass becomes more challenging to work with when you start brewing larger quantities. Not only are larger glass brewing jars fragile, but they also tend to be very heavy. You can use an acid-resistant plastic, like those for brewing beer or wine, or stainless steel fermenters.
Kombucha and Temporary Contact with Metal
Touching your SCOBY or kombucha with metal temporary will not cause any problems. If you’re taking the time to brew your kombucha, you shouldn’t have to worry about more than you need to. As long as you’re using a standard kitchen utensil and some common sense, i.e., don’t take your rusty garden trowel and use it to stir in your sugar. So don’t worry about temporary contact; your SCOBY will be just fine.
Kombucha Brewing and Aluminum
Let’s talk a little about aluminum. Aluminum is a very popular choice for kitchen products today, including pots, pans, and spoons. Aluminum is not super acid resistant, so it should be avoided when making something like cheese. With kombucha, though, you are just using your aluminum pot to brew the tea, which is pretty neutral as far as acidity goes. You can even pick up the SCOBY pellicle with your aluminum spoon. You just want to avoid prolonged exposure. As soon as you add the SCOBY and the starter tea into the equation, the acidity gets lowered, and then you want to be a little more careful with your utensils. Over time, the aluminum will start to break down due to the acidity, so you don’t want to forget your spoon in your brew jar or use your aluminum pot as your brewing vessel.

Can you Brew Kombucha in Stainless Steel?
Food grade stainless steel – if you’re using stainless steel anywhere in the kitchen, it’s good to make sure it is grade 304 or higher. This stuff is non-reactive, won’t rust and is lightweight. I would highly recommend it for material for your spigot or fermenter if you plan to purchase one.
Kombucha Brewing: Should I Avoid Metal Altogether?
You definitely can avoid using metal if you please, although my point in writing this post is to remove a bit of stress associated with the idea of metal. As long as whatever you’re using isn’t soaking in the kombucha, as a spigot would, you don’t have to be too crazy about avoiding it. Many people suggest using wooden spoons only, and that, of course, is okay provided it hasn’t been oiled up and isn’t moldy. As far as spigots go, stainless steel is the best. The only other valve I would recommend is a wooden spigot. Always avoid plastic or cheap metal spigots. For most home brewing, one or two-gallon glass jars are a great vessel. If you decide you want to make a five-gallon batch – you can opt for the plastic brewing buckets that are available at your local homebrew supply shop.
Have you wondered about metal and kombucha? Hopefully, this helped ease a little tension around the idea and will allow you to focus on other things like what flavor you’re going to choose next!
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Hi Ruthie,
I use a large stainless steel 304 grade vat for my Kombucha and it has been coming out with a metalic taste, the first pur of the kombucha in a glass goes green within a few hours but the next pours are ok but still has the lingering metalic taste. The scoby is fine and growing well so far and I have done 3 batches in this stainless steel vat. Should I be concerned about this and how do I get rid of the metalic taste?
Thank you so much for your reply
Hi BJ. That sounds a little weird. 304 Stainless Steel doesn’t react and shouldn’t leave a metallic taste, nor should it turn green. I have several and this does not occur. I would drain the vat and kind of take a look at the inside. What is the pH of your kombucha in there? Is the pour spout you’re using also stainless? Do you just drink it straight from the vat or do you do a secondary fermentation?
Hi
what about storing your final kombucha product in normal metal cans? Is this no metal thing just for the SCOBY part?
Thank you
Hi Jay,
It depends on the type of metal and if they are properly lined. It isn’t just for the SCOBY, it’s because kombucha is so acidic that it can react with many types of metal. 304 stainless steel doesn’t react but some of the cheaper stainless steel will so be SURE that it says 304 grade. Most cans are aluminum now and are lined with a food grade liner that can stand up to acids because most shelf stable food is acidic.
Hope this helps!
I’m 87 and this was my first batch. Is there anything wrong with using freeze-dried organic strawberry powder in our second fermentation? Should we also add sugar and, if so, how much?