2. wastewater from agriculture in the current crop. Farmers use more chemicals, such as chemical fertilizer, rid the enemy พื. The substance may be stranded on some fruits and vegetables might have scattered on the ground. When the rain and rain water will wash them down the river canals, which is disease pathology and may become. As a result, users of the river canals get germs. 3. waste water from industry. The water used for cleaning tools and space in the factory and wastewater from factories and waste water will be flowing into the river canals. Some factories may have material from certain industrial products confused with wastewater. All of this is why River canals rotten odor. Toxin mingle is becoming toxic pollution to the environment. Make certain kinds of water plants in food could not be created and growth due to deterioration and make the animal in the water to die.
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