Our sand gravel washing plants are used by many of the worlds leading construction materials producers to 1. Maximise equipment life. 2. Maximise resource yield. 3. Minimise waste. Sep 05, 2020 Sand And Gravel Wash Plants For Sale. The function and function of sand and grade wash plant is to clean sand and stone. The new spray wheel sand washing machine independently developed by LDHB is a new type of wheel bucket sand washing equipment which can be used with sand making machine or fine sand recovery machine.