Process of or Process for in this situation?

English as a Second Language English Vocabulary, Grammar and Idioms
1

“The… shows a process of purify water” or “The… shows a process for purifying water?”

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“The… shows a process for purifying water

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3

Look at the two sentences below:

  1. This is the process of the purification of water; remember it.
  2. This is the process for purifying water; adhere to it.
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