Abstract: A combined valve and filter mechanism for use in chemical apparatus comprises a valve body having a valve seat connected thereto. A valve stem has a valve at one end thereof for engaging said valve seat and has a cylindrical filter element for telescoping within the valve seat. The mechanism permits filtration of the chemical in situ without a separate filtering mechanism while providing a valve which when open or closed permits the agitation of the chemical in the apparatus without interference with or from the valve and vice versa. In the fully open position, the entire contents of the apparatus can be withdrawn from the apparatus.