Pond Boss Forums INTRO Questions & Observations aeration

Initially start 15 minutes per day. If you can smell the water where the airstation is bring up the water to the surface, if it smells like rotten eggs, keep running it at that run time per day until you can no longer smell it. Then you can start doubling the run time every day, again pausing at that run time if you smell the sulfur smell.

That is Hydrogen Sulfide and can kill fish at very low concentrations - you don't want to mix that with all your pond water too fast.