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Message: [QUOTE="brokensword, post: 329001, member: 3486"] FF: I hope Meyer will confirm this but an aerator doesn't add much O2 to the water column. It is the disturbance it creates at the top, the surface to air exchange that is important, hence why waterfalls work so well in this regard. In the winter, the aerator is to help keep a hole open in the ice as whatever is decaying in the pond will suck up some of the available oxygen on its way to releasing toxic gasses. Again, I hope Meyer will confirm or correct this assertion. Michael [/QUOTE]