I just treated my duck weed with Sonar, and think I having a O2 problem. It a third of an acre pond. We've got an air pump and one defusser head going, but that may not be enough. We're on day 8 after the treatment and the duck weed is turning a pail brown. I have some jumbo cats slowly swimming on the surface, and pulled a 20#er out dead this morning. I think I need to get another air pump going ASAP. Does any one know where I could pick up a diaphram pump up at one of my local stores (TSC, Lowes, etc.)? I'm not sure I want to wait for mail order. What about putting a sprinkler onto the pond. Do you think that would help?
I will figure something out, buy any advice would be appreciated.
Thanks

Mike