Every couple of months the little pump, which is slightly larger than a printer cartridge, gets jammed up with algae, even in the winter. The fish may be hibernating (well, not "true" hibernation), but the algae is not. Algae is growing even when ice covers the pond, and thus algae requires oxygen too.
|Cheryl at a swimming pool in Greece in October.|
I know, all too well, what happens when ice covers the pond, and there's no airhole. Pee-yew! Everything is dead.
The breath may not be that interesting to us as a meditation object, but if we didn't have oxygen, we'd suddenly find the breath very interesting. Stop. Watch your breath. Look around you at the people who are sharing your air space. Look out the window and notice trees that are sharing your air space.
We all need oxygen--even the algae.