Go pick up a "sample kit" and collect it, then have them send it off for testing. Just like soil testing, will give you some sorta facts to fight with for minimal cost. Soil testing is usually around 50 bucks.
And before you say it's the water, not the dirt. The heavy materials lay on the bottom of the pond (soil). That's where you find the chemicals that need testing.
Good chemicals or bad chemicals...or a higher than norm of something.
Just my opinion.
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