EM Mudballs are commonly used in Japan and other countries to treat aquatic environments. By throwing the balls into the water, they sink and embed themselves into the sludge. As the beneficial microorganisms ferment and decompose the sludge, amino acids and saccharides are produced. This increases phytoplankton that begin to eat the release nutrition.
The increase in life also increase oxygen in the water, and ups the population of oxidative beneficial bacteria. Eventually the sludge is fully decomposed and the beneficial microorganism populations create a self-purifying ecosystem.