Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Pond full of dead fish

Move the diffuser shallow to add movement but not mix deep water. At least that way you get some benefit. Emergency aeration is usually by paddlewheel aerator or circulator or other surface disturbing method.

Cody Comment.
I agree with Ewest. When your pond is going through a DO shortage it is best to move the bottom diffuser shallow to minimize the distribution of DO deep which even dilutes the DO more. Your goal during a DO crash is to get as much oxygen dissolved into water as possible and keep it in a relatively small area so fish at least have one area or section where DO is high enough for survival until things stabilize in the pond.