I agree with Ogawa only,
assuming we are talking of temporary vats to knock the ponds into one,
the wind chill factor at this time of year would be horrendous for temp vats, even if heated,
also getting bacteria to grow on pond walls and base, and in new media, is nigh on impossible unless heated to 16C
Also so called " new pond syndrome " problems would be harder to deal with in cold weather / water !
Peter.
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