
We have a lagoon.
It isn't the kind of clear-blue water in paradise type of lagoon. Ours is a "waste stabilization pond," commonly called a "lagoon" by someone with a strange and warped sense of humor. We have a lagoon because we are too far from town for a sewer line and because our ground is officially a "wetlands" and won't support a septic tank. Our lagoon sits between the house and the road, just to the East; and it consists of a 40' by 40' depression with water in it, surrounded by a six-foot berm of dirt, topped by a six-foot fence. It is NOT attractive.
I have seen several turtles and a muskrat swimming in it, and last Fall I began to see a bright lime color floating on the surface of the water. Diagnosis?
Duckweed.
Duckweed is an invasive, hard to remove aquatic plant that can clog the "laterals" that carry waste to the lagoon, keeping the lagoon from doing its job. You can buy an expensive chemical to treat duckweed -- and treat it and treat it, repeatedly -- or you can do as I did today. I drove to Culver's Fish Farm in McPherson and bought four 10" grass carp. They LOVE duckweed, they don't reproduce, and they were cheaper than one treatment of the chemical.
Tonight my very own disposal unit of four is working away, making my world a cleaner place to live.