
- Decreasing number of oxygen dissolved in the water because most of the oxygen used by bacteria to make the process of waste decomposition.
- Inorganic waste into the river, could result in prevents sunlight that is preventing the process of photosynthesis from aquatic plants and algae, which produce oxygen.
- Detergents very difficult broken down by bacteria so that it will remain active for long periods in water, polluted water and poisoned the various aquatic organisms.
- The use of detergents on a large scale also increase phosphate compound on the river or lake water, which stimulates the growth of algae and water hyacinth (Eichhornia crassipes).
- The growth of algae and water hyacinth which causes uncontrolled surface water in the lake or river is closed thereby blocking the entry of sunlight and resulted in inhibition of the process of photosynthesis.
- Water plants (water hyacinth and algae), which brings death due to decomposition of this plant will spend the supply of oxygen.
- Materials decomposition aquatic plants will precipitate and cause silting.

(Eichhornia crassipes)
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