The replacement filters are divided into four main categories:

  • Mechanical that removes contaminants from water with different size screenings indicated by micrometers.
  • Absorbent whose activity is based on the ability of filtering mass to bind impurity to itself.
  • Ion exchange, whose function is based on the phenomenon where, as the impurity passes through the filter mass, its composition becomes a second harmless compound.
  • For oxidizing or reducing, in which the pass filter through the filter is changed so that its adverse effects are already neutralized in the filter.
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