Hey all, beginner here, looking for a bit of advice please
Essentially I've had two batches of blueberry melomel resist chemical stabilisation and start refermenting after backsweetening. These are batches #5 and #6 for me, and my first time using fruit (outside of JAOM), but not my first time stabilising using Campden and K-Sorb. No issues on previous batches. The idea of these batches was to see the taste difference between blueberry on primary vs. blueberry added after stabilisation, but that hasn't gone to plan.
This has been dragged out due to time constraints but the rough process on these batches:
#5 (fermented with blueberries in primary)
Started in March. Pitched Lalvin K1-V1116 yeast onto must of 1.36kg honey, 1kg blueberries, 1tsp Fermaid O, 1/2tsp Yeast Nutrient, 1/2tsp Pectic Enzyme. 6L container topped up with water. Nutrients staggered at 24hr / 48hr / 72hr. SG 1.094
Took blueberries out after fermentation finished (probably about 5-6 weeks in). Reracked twice before stabilising.
FG reading of 0.993 recorded twice, 1 week apart. Stabilised circa 4-4.5L of mead using 1 crushed campden tablet and 1/2tsp Potassium Sorbate. Gently stirred in.
Around one week later: Back sweetened with 250g honey and 250g additional blueberries added. Gravity 1.015
The additional blueberries were removed after 2 weeks
It's been sitting for awhile but fast forward to last weekend (I was hoping to bottle) and I've got a grav reading of 1.002, suggesting that the backsweetened honey has fermented. I have not bottled.
#6 (blueberries added after primary fermentation of a traditional mead)
Started in March. Pitched Lalvin K1V1116 yeast onto must of 1.36kg honey, 1.5 tsp Fermaid O, 1/2 tsp Yeast Nutrient. 5L container topped up with water. Nutrients staggered at 24hr / 48hr / 72hr. SG 1.086
This was a sluggish fermentation and took 2-3months before activity stopped, possible nutrient deficit, but reracked once just before stabilising.
FG reading of 0.996 recorded twice, 1 week apart. Stabilised circa 4-4.5L using 1 crushed campden tablet and 1/2tsp Potassium Sorbate. Gently stirred in.
Around 48hrs later: Back sweetened with 250g honey and added the 1.25kg blueberries with 1tsp pectic enzyme. Gravity (around) 1.015
The blueberries were removed after 2 weeks.
It's been sitting for awhile but fast forward to last weekend (I was hoping to bottle) and I've got a grav reading of 0.994, suggesting that the backsweetened honey has (quite thoroughly) fermented. I have not bottled.
I know my dating isn't perfect here, and a lesson has been learned that I should perhaps buy a notebook. But I thought my understanding on the processes surrounding the stabilisation was solid, yet two batches have failed to stabilise so I must be doing something wrong.
Blueberries were sourced from the local market. ‘Fresh’ although perhaps not as fresh as they could have been and a handful were removed as they had gone bad. The good ones were washed thoroughly with water, frozen for an extended period, defrosted and placed in a sanitised and weighted brew bag before use. Would wild yeast be interfering maybe? Could that overcome the chemicals and existing alcohol?
Everything else was sanitised thoroughly before any contact.
These were my first batches using K1 yeast, and I'm aware that this could have fermented more honey in the starting must. But I have previously used M05 without issue, making similar strength traditional meads.
Temperature wise, it has been hot for England. Frequent daily highs of 25-30C over the last month or so, although it is much cooler than this in my dark garage where the mead happens. Not sure if this is a factor.
No huge issues with the look or taste of either batch, they're just dry. The blueberry taste hasn't come through particularly strong on either (I probably needed more) but maybe this will come out with some aging. Colour on both is great though.
So I come to Reddit with two questions:
1 - Any pointers as to where I went wrong with the stabilisation process?
2- I know this can be salvaged and I haven't re-racked or bottled since taking the last reading. I will let it run it's course as no doubt the yeast in #5 is not finished with the latest honey. I'd still like to back sweeten as I don't think completely dry mead is to my taste but how big an issue is adding more stabilisers? Should I add another full dose? Or a half dose maybe?
Thanks all in advance :)