2. Industry sources The organic waste into waterways, causing sewage also may release toxic metals and toxic compounds such as lead, mercury, cadmium, arsenic and cyanide into the water with 3. Agricultural sources Because farmers use fertilizers, pesticides and pesticides in the country. Fertilizers, insecticides and pesticides, as well as manure. Will leach into the water flow. Therefore, the accumulation of these substances in the water more in the upcoming Champions Sainsbury's application and accumulation. Toxic heavy metals in the water. It is harmful to plants and animals in the water.
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