As for chemicals, again, if the chemicals are legal, and legally applied to use in pond A, and they harm pond B. The owner of pond B accepted all risk of what may flow in....
Because a chemical is legal doesn't mean it has really been tested to be safe even when used according to the label. Two experiences I have had.
When coming home and getting out of my car I was overpowered by a strange smell and couldn't get my breath, thinking I was going to suffocate. I went into the house and could breath. I then went outside on my upper deck to see if what I had just experienced was still there and again couldn't breath. I stayed in the house for sometime until the air cleared. I told my farmer about it and he said he experienced the same thing and quite using the chemical. I had no idea it was spray from my farm.
I was a pattern maker as my occupation. About 20 of us in a large building were at work and we started to use a new epoxy for radius's on the patterns. Within an hour our faces and fingers started to go numb and we cleared the building. That's the reason I don't trust legal chemicals as some do. I could site other incidences of legal chemicals gone bad.
