The working principle of the grid cleaner is to fish and clean the floating objects and sediments at the water intake, and drain the grid slag after being squeezed dry and dehydrated, which is suitable for urban sewage treatment and other engineering projects. Because the grid and water flow form an angle of about 35 ° and because of the formation of baffles, many dirt can be separated even if its thickness is less than the grid gap. In addition, most of the grids are equipped with flushing devices, with self-cleaning function. The cylindrical structure can also increase the discharge of the grid compared with the traditional grid, reduce the head loss, and reduce the accumulation plane in front of the grid.

Generally, the grid cleaner is used in the comprehensive printing and dyeing wastewater treatment with large water volume and complex water quality, such as the wastewater treatment in the textile printing and dyeing industrial park with a capacity of more than 10000 tons. Because this kind of wastewater has large water volume and large suspended solids, only the grid can intercept the larger suspended solids, and it is not easy to block.