This invention employs natural enzymes to activate microbes that break down sludge and toxic substances such as organic compounds existent in polluted water, while at the same time being easily employed on rivers, lakes and water treatment plants. A water purification agent is disseminated via a process of drip distribution into polluted water, resulting in the activation of microbes, which, through their activities, purify the polluted water. The water purification agent is comprised of a mixture of the following: natural enzymes, which, when introduced into polluted water, activate microbes that break down sludge and toxic substances such as organic compounds and sulfides, leading to purification of the water; and a solution of yeast in citric acid water, which facilitates a catalytic reaction that enables the microbes in polluted water to be activated.