Lackeby Grit classifier

Lackeby Grit classifier is designed to separate sand or other types of sedimentary particles. The robust design guarantees high reliability and a long technical service life, while maintenance requirements are minimal.



The incoming water flow is led into the wider section of the tank through the top-mounted inlet. A vertical plate creates an even laminar flow, which enables the solid material to settle. The outlet is positioned in the narrow section of the tank, which is fitted with an overflow channel to reduce the risk of particlemigration. The tank’s walls slope steeply to avoid the risk of bridging. Settled material is transported out via a shaftless pulling spiral for maximum dewatering. This shaftless spiral reduces the need for maintenance, as there is no bearing at the bottom of the through.


As standard, Grit classifiers are manufactured in stainless steel (1.4301) or (1.4436). The unit is fitted with a shaftless spiral made of mild steel (S355J0) in the bottom of the through. Throughs are coated with Hardox wear bars or Robalon wear liners.

Technical features

Process benefits

  • Robust design
  • Long technical service life
  • Shaftless screw conveyor for outfeed of dewatered material
  • Without bearing at the bottom end of the conveyor
  • Enhances efficiency of separation process for solid material
  • Maximises dewatering
  • Minimises maintenance


Lackeby Products has over 100 Lackeby Grit classifier installations at industrial and municipal plants both in Sweden and abroad.