The wide spectrum of algae that inhabit stagnant waters can be the source of significant problems, causing odors and reducing the palatability of fresh water for livestock. Algae can also restrict the recreational use of ponds, and can have a devastating effect on the visual appeal.

Two common genera of algae, Nitelia and Chara, which strongly resemble flowering plants, are often found in stagnant ponds and other similar bodies of water. These algae feature body parts that appear to be stems, roots, and leaves. Unfortunately, herbicides that are usually employed to treat ponds and lakes to remove aquatic plants do not affect these algae, and most of the common algae treatments will not control or reduce their growth.