How interesting! I just got into Kombucha brewing recently. A friend gave me a jar of kombucha with several old scobys. I started a new batch out of the newest one and saved the middle ones in another jar. I was about to just throw the old ones out, but thought my chickens like them. They loved it. However, I did not cut it up into pieces first and was amazed how much trouble they were having tearing pieces off. Not sure what happened to it. They were taking turns playing "keep away" with it last I saw! Next time, I will cut it up.
Kombucha scoby for the girls? - Page 3
You could try using a bit of food grade h202. I buy it in gallons (35%) and dilute it down but it's great for keeping water from growing all kinds of bad stuff. I also use it to clean produce, in laundry and in dishwasher. But it needs to carefully be diluted because it burns (wear gloves.) Just my 2 cents. I've tried adding Kombucha to my pets water and they weren't very keen on it. Now if I want to add some I add it to the feed instead. Colloidal silver is an antibacterial as well. It can be added to the water.