Question:

I read that phosphates can cause high ph problems. They can come from plant fertilizer. I live around a lot of farm fields who use crop dusters. How can I get my ph down to a normal level?

Answer:

Using a Phosphate Remover would help bring your phosphates down. The problem with this situation is that it is going to keep occuring. With the crop dusters being used over and over once you fix your phosphate problem, you will have it again.

Trying to bring your pH down to a normal level will be a continuous battle. If you can find a way to prevent the fertilizer from the crop dusters from getting to your pond then you might have a chance.