Mechanical solid separation is the fastest way to remove solids from effluent. Mechanical solid separators typically achieve high rates of solids removal. The effluent is usually pumped from a sump to the solids separator, which removes and stockpiles the solids product for later land application. The liquid is drained to a storage facility for application. This Farmfact highlights some of the key features of a passive solids separator, and the pros and cons of this type of system.