A liquid filter has a hollow-cylindrical filter element is flowed through in a radial direction. The fluid after having passed through the filter element drains in axial direction from the interior of the filter element. A drain plug is disposed at an axial end of the interior of the filter element. The drain plug forms a moveable valve member. A drain passage for draining fluid is open in the open position of the drain plug.

A liquid filter has a hollow-cylindrical filter element is flowed through in a radial direction. The fluid after having passed through the filter element drains in axial direction from the interior of the filter element. A drain plug is disposed at an axial end of the interior of the filter element. The drain plug forms a moveable valve member. A drain passage for draining fluid is open in the open position of the drain plug.

A filter device has a filter element (37) in a filter housing having a connection unit (29) forming a fluid connection to the filter element (37). The connection unit (29) feeds fluid to be purified to the dirty side (41) of the filter element (37) and is a component of the element receiver mounting the filter element (37) in the functioning position. The connection unit (29) is a component of the filter housing. The valve arrangement (61; 67, 69) is movable such that by removing the filter element (37) from the filter housing, the valve arrangement (61; 67, 69) closes and by insertion of the filter element (37) into the filter housing, the valve arrangement (61; 67, 69) opens.

A filter device has a filter element (37) in a filter housing having a connection unit (29) forming a fluid connection to the filter element (37). The connection unit (29) feeds fluid to be purified to the dirty side (41) of the filter element (37) and is a component of the element receiver mounting the filter element (37) in the functioning position. The connection unit (29) is a component of the filter housing. The valve arrangement (61; 67, 69) is movable such that by removing the filter element (37) from the filter housing, the valve arrangement (61; 67, 69) closes and by insertion of the filter element (37) into the filter housing, the valve arrangement (61; 67, 69) opens.

A filter element may include a tubular member including a partition at least partially defining first and second chambers. The tubular member may further include at least one outlet aperture and at least one inlet aperture configured to provide flow communication exiting from the first chamber and flow communication into the second chamber, respectively. The filter element may be configured such that fluid passing through the filter element from an inlet port to an outlet port passes through the first chamber, a filter medium, and the second chamber. The filter element may also include an end cap having a return aperture configured to provide flow communication between fluid exiting from the first chamber and fluid entering the inlet port, wherein a portion of fluid exiting from the first chamber is returned to the inlet port for recirculation through the first chamber.

The invention comprises a control system for monitoring and operating an existing supply water pre-treatment system for supplying de-chlorinated water to dialysis purification systems. The invention includes a controller and an operator interface for programming and interacting with said control systems. The invention further includes an injection assembly having a flow turbine sensor, a reducing agent injector, and an ORP/pH sensor for monitoring and controlling ORP/pH levels of said supply water.

A filter assembly comprises a filter head, a port, a fitting, and a diffuser. The port extends from a portion of the filter head and defines a channel for fluid to flow into or out of the filter head. The fitting first end is attachable to the port and the fitting second end is attachable to a filtration system component. The diffuser is positionable within the channel of the port and comprises an inner surface and an outer surface. The inner surface defines an inner conical hollow region that extends at a nonzero angle between the inner conical hollow region first end and the inner conical hollow region second end such that a first inner diameter of the diffuser at the inner conical hollow region first end is smaller than a second inner diameter of the diffuser at the inner conical hollow region second end.

A filter assembly comprises a filter head, a port, a fitting, and a diffuser. The port extends from a portion of the filter head and defines a channel for fluid to flow into or out of the filter head. The fitting first end is attachable to the port and the fitting second end is attachable to a filtration system component. The diffuser is positionable within the channel of the port and comprises an inner surface and an outer surface. The inner surface defines an inner conical hollow region that extends at a nonzero angle between the inner conical hollow region first end and the inner conical hollow region second end such that a first inner diameter of the diffuser at the inner conical hollow region first end is smaller than a second inner diameter of the diffuser at the inner conical hollow region second end.

Filter caps 200, 400, 500, 600, 700 are provided that include internal geometry that modulate flow characteristics above the surface of a membrane filter held within the filter cap 200, 400, 500, 600, 700. The internal geometry in some cases provide for recirculation within the filter cap 200, 400, 500, 600, 700 that provides a cross flow element across the filter membrane that reduces clogging of the filter.

A filter or intake screen 100 (“filter”) for removing parties from a fluid has a filter media 110 having a first side 120 and an opposite second side 130, wherein the fluid flows, in use, from the first side 120 to the second side 130. The filter 100 further comprises a discharge port 160 provided at a first end of the filter media 110 on the second side 130 of the filter media 110. A plurality of vanes 140 are provided to the second side 130 of the filter media and are configured to direct the flow of water from the filter media 110 towards the discharge port 160. The flow of water from the vanes 140 discharges into an interior volume 150 which is in fluid communication with the discharge port 160, wherein a cross-sectional area of the interior volume 150 decreases with increasing distance from the discharge port 160.