Can a SCOBY go bad or die, and what are the signs I should throw it out?

Question

Can a kombucha SCOBY go bad or die? Learn the definitive signs of a dead or contaminated SCOBY, including mold and bad smells, so you know when to throw it out.

Answer 1

Yes, a SCOBY can go bad. Signs you should throw it out include mold (especially black, blue, or green), a foul or cheesy odor, or the presence of maggots.

Detailed Explanation:

A SCOBY, or Symbiotic Culture Of Bacteria and Yeast, is a living culture and can indeed go bad. While a healthy SCOBY can withstand a lot and even recover from neglect, certain conditions indicate it's beyond saving. Here's a breakdown:

1. Mold: This is the most common reason to discard a SCOBY. Any mold that isn't brown or white is a sign of contamination. Black, blue, or green mold is particularly dangerous and means the entire batch, including the SCOBY, should be thrown away. Fuzzy mold is also a bad sign.
2. Foul Odor: A healthy SCOBY and kombucha have a vinegary smell. A cheesy, rancid, or otherwise foul odor indicates that undesirable bacteria have taken over, and the SCOBY is no longer safe to use.
3. Pests: If you find maggots or other pests in your kombucha or on your SCOBY, discard everything immediately.
4. Decomposition: While a SCOBY can change in appearance (darkening, developing brown spots), actual decomposition or disintegration of the SCOBY is a bad sign. A healthy SCOBY should be firm and rubbery.

It's important to distinguish between normal SCOBY changes and signs of spoilage. Brown spots are usually just yeast buildup and are harmless. A SCOBY can also sink or float, and that doesn't indicate a problem.

Pro Tip:

To prevent your SCOBY from going bad, maintain a clean brewing environment, use the correct ratio of starter tea to sweet tea, and ensure proper ventilation. A healthy SCOBY is more resistant to contamination.