Help.
Background first. Pond is in SE Lower Michigan previous owner had the pond dug in a swamp area in my back yard, 300 feet long and 250 feet wide about 15 feet deep, the previous owner ran out of money to keep digging to get to good soil, the bottom and sides are swamp peat? Very black with springs all thru the pond. I have owned the property for 21 years and always had suspended black peat, no problems and kept it stocked with BG and LMB. About 4 years ago put in about 125 catfish.
Last year during the middle of the summer the water turned milk brown, this year just yesterday it turned back to brown again.
Thank you
