I'm new on here and just became a pond owner last fall when I bought 55 acres of reclaimed mine land. One of the two ponds receives runoff from some acidic soils and I knew it was probably acidic because it is crystal clear and has no fish in it. I got a test kit and did tests on PH, nitrates, phosphate and ammonia. Everything came out normal except PH and it was 5.0. Makes sense though because the soil test on part of the area that drains into the pond called for 10 tons of lime per acre. I had been swimming in it but now I think I will stop that. It's gonna be a few years before I retire there and start working on the property but liming the drainage is going to be one of the first things I do. L