Abstract: A reusable laboratory filter unit having a recoverable filter member. The unit has an upper body or reservoir for receiving the liquid to be filtered and a lower body or receptacle for receiving filtrate. A plate for supporting the filter membrane is captured between the upper and lower bodies when the bodies are joined together. A threaded ring arrangement draws the bodies together axially without rotating one with respect to the other so the membrane is not subjected to any twisting force. Separation of the bodies exposes the support plate so it can be easily removed to recover the membrane.