Select the incorrect statement$(s)$ from the following.

  • A
    It is difficult to remove solid particles from polluted water.
  • B
    It is easy to remove dissolved salts such as nitrates,phosphates,other nutrients,toxic metal ions,and organic compounds from polluted water.
  • C
    Domestic sewage primarily contains biodegradable inorganic substances,which do not decompose easily.
  • D
    All of the above.

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