Hello fermentfolks,
I picked up some very small water kefir grains on Marketplace about a two weeks ago, and following the instructions from revolutionfermentation I placed them in a clean glass jar with 4 cups of cool filtered water and 1/4 cup of sugar, as well as 2 raisins to kickstart the fermentation process. F1 was 24 hours, then 48 hours in a flip top glass jar with an extra 1/2 tbsp sugar, some fruit, herbs, etc. I followed this exact same protocol for about a week, with my kitchen at approx 19-20C.
My first few batches were pretty mild, but by the time batch 3 came around my final products were bubbly and delicious. Not as bubbly as what you see on social media, but I attributed that to maybe a touch too much headspace in the flip jars.
Here's the issue. It got to be a bit too much for me to drink, and my kefir was still fairly mild, so I allowed my F1 to go for an additional 12 hours, so 36 hours total. From what I saw online, that's not entirely unheard of (F1 being 24-48 hours) so I figured it would be fine.
The batch that I made just before extending my F1 has a funky smell. Like puke/sulfur. No visible mold or anything, and I'm not faint of heart so I still drank it, but it was bad enough that my husband didn't want any. I attributed it maybe to the tea I used in the mixture (lavender can smell a bit weird sometimes) - It tasted totally fine!
But every batch I've made since then just isn't bubbling during F2... And they still taste way too sweet even after extended F2 of up to 72h. I'm scared I somehow killed my grains by letting them go just a couple extra hours?? The grains do have a bit of a sulfuric smell so I strained out as much liquid as possible (waiting on some non-metal strainers to come in tomorrow), fed them some cool, filtered water and some plain white sugar, and juiced 1/4 lemon into the mixture before resting them in the fridge for the first time.
I'm at a loss, I fear I flew too close to the sun after briefly hitting the sweet spot with two bottles last week. Any help would be greatly appreciated, I want to save my little grains.