I am so glad I found this forum. You guys are a wealth of knowledge and I appreciate your help. My system is a 3/4 hp EasyPro running four diffusers. I have them running down the center, equal distances apart, in the deepest area. I will leave them there based on your suggestions, and I will run them 24/7 until it gets colder.

When do you know it is time to go to winter time operation? By the temperature of the water or air temperature? Also, same question as to when to start up in the spring?

Is there any issues to watch out for when running just one diffuser with the 3/4 hp pump?

Final questions, I have the diffusers hooked up to a 4 valve manifold that is near the pond. I have adjusted the valves so all the diffusers look like the are producing about the same about of air. If I don’t do this the deepest one doesn’t put out much air. The pressure gauge at the pump read about 10 psi. Is this normal and should I be trying to balance out the diffusers output using the valves?

I plan to buy the 2015 issue that covers winter time operations, which hopefully will answer my questions.

Thanks again for your help. I was getting a lot of conflicting information.