I ad 1 liter of 60% acetic acid to 1 000 liters of feed, that takes
care of mould for at least the week it takes the bees to bring it down
from the feeder. I believe it can keep for up to 2 months in this
concentration in autumn temps of 15°.
I'm using 30 liter feeders. When leaving feeders on during winter
there will be condensation and added moisture later that can cause
mould in the now empty feeders.
--
P-O
beeman.se
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