PP AQUATECH PVT LTD Grit removal from wastewater is very important to reduce operational problems of the wastewater treatment plants and to reduce maintenance of the mechanical equipment installed in it. Grit and other solids can increase wear of the mechanical equipment, cause pipe blockages, can settle and reduce the effective volume of the treatment basins. PPAPL Vortex Grit Chambers (PPA-VT) are designed to separate grit from organics and raw sewage water.