My small pond keeps foaming. Dose anyone have ideas?

I have a pond that is 125 gallons. I started it in early spring and it has been doing well until this month. It has been foaming a lot. When the weather got really hot it started foaming. I have done all I can think of. I tested the PH and it was a little high so I put Ph down in it. I tested it again 24 hours later and it was lower but still foaming. It gets a little greenish brown film on it sometimes that I skim off. I have used water clear and clear zyme in it always following directions. I have replaced and cleaned the filter (no soap was used. I have taken half of the water out and put new in. The fish I have are doing fine. I only have 1 water lily in it and isn't real big. It seems to be doing ok. I have a fountain in it for airation. I have looked in my pond books but they don't give any answers. The place where I buy my pond stuff didn't have a clue. Please respond if you have a pond and know what it could be.

Thanks

My small pond keeps foaming. Dose anyone have ideas?
Have you been changing out any water or only adding. It may be a build up of total dissolved solids. It might also be proteins if you have fish and plants. Did a fish die or did you recently use an algaecide. Try to replace about 20% of the water weekly. RScott
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Persistent foaming indicates a heavy concentration of undissolved organics. ...



PS my pond is about 2000 gallons
Reply:i think their is a condtioner that makes it stop doing that .....
Reply:There is something you can buy called Foam Down, but it is for hot tubs, which I don't know if it would be healthy for your fish and plant. Go to the store and I'm sure they could answer that question. It does work wonders in our hot tub, takes the foam right out. Since you said it was hot it just might work.