Pond De-Icer or Pond Air Pump? Which should be used?
Winter Survival for the fish in the pond depends in large part on the availability of oxygen.
A Pond De-Icer will keep a hole open in the ice which may form on top of the pond and let harmful gases like carbon monoxide escape and oxygen enter. A De-Icer (or two for large ponds) is usually enough keep Goldfish alive and well.
Pond Air Pumps infuse large amounts of additional oxygen and should be used in ponds with larger Koi and Golden Orfe, because the need for oxygen is much greater for these pets.
In some very cold areas where long periods of ice and snow are expected both should be used if large Koi or Golden Orfe are present in the pond: Pond Winterization
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