In gravity filters, the underdrain is one of the most important components contributing to overall system performance and operation — whether a new filter design or retrofitting of an existing filter. De Nora Water Technologies offer TETRA LP Blocks dual parallel lateral underdrain and the TETRA U Blocks underdrain for drinking water and desalination pre-treatment applications.

  • Low headloss
  • Easy installation
  • No moving parts
  • Even backwash distribution
  • Reduced backwash water
  • Lower operating cost
  • High resistance to uplift from the filter floor
  • Fewer blocks and grout required

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