The present invention describes a disposable filter unit (1 ) intended for a system (10) allowing for purification and recycling of water or separation of water, said disposable filter unit (1 ) comprising an outer body (2), a top (3), a bottom (4), an inflow (5), an outflow (6) and a filter means (7) enclosed in the outer body (2), wherein the inflow (5) is positioned adjacent to the bottom (4) and the outflow (6) is positioned adjacent to the top (3), and wherein the inflow (5) and (10) outflow (6) are arranged to be fixated simultaneously into the system (10) and released simultaneously from the system (10) enabling a simple replacing of the disposable filter unit (1 ) for a user, and wherein the system (10) comprises a mechanical filter fixating / releasing unit (8).