Embodiments are directed to filtration container assemblies and methods of using the same. A filtration container assembly includes an outer container and a plunging assembly. The plunging assembly includes an inner sleeve, a filtration assembly, and a cap assembly having a pressing surface. When the outer container is at least partially filled with liquid, a user can exert pressure on the pressing surface of the plunging assembly to nest the plunging assembly within the outer container, using positive pressure to displace the liquid in the outer container through the filtration assembly into the inner sleeve. In some embodiments, at least a portion of a handle for the filtration container assembly may be a part of the pressing surface.

In one aspect, a modular filter assembly for filtering fluid that flows in a flow direction therethrough is disclosed. The assembly includes a first housing section having a first filter element; a second housing section having a second filter element; and a connector disposed between the first and second housing sections. A housing includes the first housing section, the connector, and the second housing section. The flow direction is through the first and second filter elements in series.

A movable seal for interfacing between a first surface and a second surface includes a floating portion attached to a non-floating portion by a flexible coupling portion, wherein the non-floating portion is coupled to the first surface by nesting in a groove on the first surface, and wherein the non-floating portion forms a seal between the first and second surfaces when the first surface moves relative to the second surface in a first direction, and wherein the non-floating portion does not form a seal between the first and second surfaces when the first surface moves relative to the second surface in a second opposite direction.

A filtration container assembly generally includes an outer container having a first end and a second end and defining an inner cavity, and a plunging assembly configured to be received within the outer container inner cavity, wherein the plunging assembly includes an inner sleeve having a first end and a second end and an outer wall defining an inner bore, wherein the outer wall is continuous from the first end to the second end, and a filtration assembly coupled to the inner sleeve at the second end.

In one aspect, a modular filter assembly for filtering fluid that flows in a flow direction therethrough is disclosed. The assembly includes a first housing section having a first filter element; a second housing section having a second filter element; and a connector disposed between the first and second housing sections. A housing includes the first housing section, the connector, and the second housing section. The flow direction is through the first and second filter elements in series.

A movable seal for interfacing between a first surface and a second surface includes a floating portion attached to a non-floating portion by a flexible coupling portion, wherein the non-floating portion is coupled to the first surface by nesting in a groove on the first surface, and wherein the non-floating portion forms a seal between the first and second surfaces when the first surface moves relative to the second surface in a first direction, and wherein the non-floating portion does not form a seal between the first and second surfaces when the first surface moves relative to the second surface in a second opposite direction.

A filtration container assembly generally includes an outer container having a first end and a second end and defining an inner cavity, and a plunging assembly configured to be received within the outer container inner cavity, wherein the plunging assembly includes an inner sleeve having a first end and a second end and an outer wall defining an inner bore, wherein the outer wall is continuous from the first end to the second end, and a filtration assembly coupled to the inner sleeve at the second end.

A filtration container assembly generally includes an outer container having a first end and a second end and defining an inner cavity, and a plunging assembly configured to be received within the outer container inner cavity, wherein the plunging assembly includes an inner sleeve having a first end and a second end and an outer wall defining an inner bore, wherein the outer wall is continuous from the first end to the second end, and a filtration assembly coupled to the inner sleeve at the second end.

A movable seal for interfacing between a first surface and a second surface includes a floating portion attached to a non-floating portion by a flexible coupling portion, wherein the non-floating portion is coupled to the first surface by nesting in a groove on the first surface, and wherein the non-floating portion forms a seal between the first and second surfaces when the first surface moves relative to the second surface in a first direction, and wherein the non-floating portion does not form a seal between the first and second surfaces when the first surface moves relative to the second surface in a second opposite direction.

A movable seal for interfacing between a first surface and a second surface includes a floating portion attached to a non-floating portion by a flexible coupling portion, wherein the non-floating portion is coupled to the first surface by nesting in a groove on the first surface, and wherein the non-floating portion forms a seal between the first and second surfaces when the first surface moves relative to the second surface in a first direction, and wherein the non-floating portion does not form a seal between the first and second surfaces when the first surface moves relative to the second surface in a second opposite direction.