Pre-treatment unit

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The GDE/D model performs: screening, sand removal, fat and grease manual removing.

GDE o GDE/D could be supplied in 2 models:

  • CLS sand classifier + FCP/C screw screen in tank, with perforated rounded or wedge wire profile.
  • CLS sand classifier + GRR drum filter, with wedge wire profile.

Based on the chosen model, pre-treatment combined unit, you can get (it will be possible to get) a different type of screening.

The sewage goes through the screening section for the solid parts removal.

Then the sewage falls down a decantation tank where the particles go down. Here an extraction spiral removes them.


  • Odor-free
  • No clogging
  • Low maintenance and operation costs
  • Low room needed
  • No construction works needed
  • Easy to install and operate
  • Very low residual organic content in the washed out solid
  • Volume reduction (up to 40%) of the washed out solid
  • Sand removal: >=90% of particles up to 200 μ