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In general pollution is anything hat negatively impacts the environment. Warming of the water by introducing a warm effluent:

  • Reduced the amount of oxygen in the water
  • Interferes with the breeding success of fish
  • Encourages the growth of lower quality fish and plants
  • Promotes bacteria; growth
  • Dissolves materials in the sediments
Separate from these long term problems, the sudden transition from cold to hot water can kill fish. This is why fish owners give fish time to get used to the home tank temperature before releasing them from the transfer bag. This would happen if the fish swam through cold water into a stream of hot effluent.
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