Ah, Buffy. I never thought about the koi pond. I read instead on an internet forum that it was just like water after 24 hours, so I just drank the rest of the bottle myself

.
I ll say it again, it's inexpensive, even with a small flock it's less than a pound a head.
Except with a really small flock, it isn't really.
We have ten sheep - six on Heptavac, two on ovivac and two not known, bought at auction.
So this year we're looking at one bottle for the annual booster, a second as a follow-up jab for the ones not already on hep-p, and then two bottles four weeks apart for our 11 lambs. So just like Devonlad, our bill this year will be just over a hundred quid. That makes it either £10 or £4.75 a head depending on how you look at it.
No wonder folks want to keep it in the fridge eh?