We own a 3 acre pond that is 20 feet deep at the deepest point. It has a serious algae problem with heavy blooms all summer, including blue-green algae later in the summer.

We had a biologist with a local university do some sampling. She told us the algae was the most she's ever seen and the phosphorous level was also the highest she's ever seen. There was almost no dissolved oxygen below three feet.

Question: Will a chemical treatment take care of it, or do we need to install an aerator? Or both? I'm a bit concerned about the cost of an aerator.

Chemicals are considerably cheaper, of course, but if I need to treat the pond several times a year every years, the cost of chemicals will certainly add up, too.

Appreciate any help.