Pond Boss Forums INTRO Questions & Observations Diffusers

Someone familiar with the Winters near Lampasas could give a more definitive answer, but Bill has laid out the ground rules. If I may attempt to expand, below 48deg dissolved O2 is high and fish metabolism is low, therefore aeration is not (nearly as) warranted. But if you get dirty ice/snow cover that blocks sunlight from penetrating into the pond, plants produce no O2 and the plants and fish are both consuming it. Under these conditions you want to do SOME aeration (enough to blow a hole through the ice, not so much that you cause supercooling).