16 years ponding and hopefully 16 more!
- Jul 27, 2012
- Reaction score
- Hardiness Zone
I also had a floating heater that did keep some ice open but at -25 C or colder it froze over and the airbreather froze also.I do not envy you true Northerners. Heat is so much simpler to deal with than ice-over. I fell that bottom-line your aim should be to devise a method that will work for you that will maintain some water/atmosphere interface (hole in the ice).
Although some oxygenation does occur at the surface of the air bubbles generated by sub-surface aeration, the amount is quite small when compared to what occurs at the interface as a result of water turbulence created by these same bubbles.