A filter device has filter elements (23) received in a filter housing (1) with a filter inlet (19) and a filter outlet (21). Flow passes through the filter elements (23) for a filtration or backwash in both directions. At least one filter element (23) performs the filtration. At least one other filter element (23), for cleaning off its active filter surface, can be backwashed by a backwash appliance. For supporting the backwashing, the appliance contains a pressure control (43) having a pressure control element (45). During a backwash operation, the fluid flow is controllable in a fluid connection between filter inlet (19) and the filter element (23) that is to be cleaned off. The fluid connection has a connection space (29) having element openings (27), each of which can be connected to an open end of the filter cavity forming the unfiltered side of each filter element (23). A fluid pathway (27) is provided via which, during the filtration, unfiltrate flows into the connection space (29). By the pressure control element (45), the flow of unfiltrate through the element opening (27) associated with the filter element (23) that is to be cleaned off can be controlled.

A filter device has filter elements (23) received in a filter housing (1) with a filter inlet (19) and a filter outlet (21). Flow passes through the filter elements (23) for a filtration or backwash in both directions. At least one filter element (23) performs the filtration. At least one other filter element (23), for cleaning off its active filter surface, can be backwashed by a backwash appliance. For supporting the backwashing, the appliance contains a pressure control (43) having a pressure control element (45). During a backwash operation, the fluid flow is controllable in a fluid connection between filter inlet (19) and the filter element (23) that is to be cleaned off. The fluid connection has a connection space (29) having element openings (27), each of which can be connected to an open end of the filter cavity forming the unfiltered side of each filter element (23). A fluid pathway (27) is provided via which, during the filtration, unfiltrate flows into the connection space (29). By the pressure control element (45), the flow of unfiltrate through the element opening (27) associated with the filter element (23) that is to be cleaned off can be controlled.

There is disclosed a liquid filter system that includes a liquid filter apparatus configured to self-clean without removal of the filter apparatus from the filter system. The filter apparatus uses both a filter media for filtering solids as well as a spin motion imparted to fluid being filtered so that centrifugal force can remove solids from the liquid being filtered. The liquid filter system also includes a gas pulse nozzle in fluid communication with the liquid filter apparatus and is configured to flow gas into the filter media to expel water and debris trapped in the filter media without removing the filter media from the filter system.

A filter device for cleaning particulate contaminants from a fluid flow, includes a plurality of filter elements (34, 60) accommodated in filter chambers (12, 14, 32) as components of a joint filter housing (10) and grouped around a backwash device (20) having a piston accumulator (56) for receiving a backwash fluid. In the storage housing (64) of the piston accumulator, a piston (57) is guided in a longitudinally movable manner, is controlled by a pressure medium, and passes on the backwash fluid stored in the storage housing (64) on to at least one filter element (60) to be backwashed for cleaning purposes via a backwash device (20). The backwash device also discharges the backwash fluid from the filter device. A specific filter element as a bypass filter element (34) is selected from the plurality of filter elements (34, 60), and exclusively removes particles after a changeover device (18) has been actuated, while the other filter elements (60) are excluded from this removal process.

An apparatus for cleaning pool or spa filters includes: a housing; a turntable assembly in the housing, the turntable assembly configured to receive a filter thereon; and a fluid assembly on the housing configured to receive liquid from a liquid source. The fluid assembly includes: a spin jet configured to spray the liquid on the turntable such that the turntable and the filter thereon spin; and at least one power jet configured to spray the liquid on and/or through the filter while the turntable assembly and the filter spin.

Aspects herein include monitoring devices for filtration systems. An embodiment of the monitoring device can include a first fluid conduit and a first pressure sensor, wherein the first pressure sensor is in fluid communication with the first fluid conduit. The monitoring device can also include a second fluid conduit and a second pressure sensor, wherein the second pressure sensor is in fluid communication with the second fluid conduit. The monitoring device can also include a control circuit in electronic communication with the first pressure sensor and the second pressure sensor. The monitoring device can also include a housing, wherein the first pressure sensor, the second pressure sensor and the control circuit are all disposed within the housing. Other embodiments are also included herein.

Modular fluid processing apparatuses, modular components and related methods are provided. A fluid processing apparatus for use in fluid processing systems can include a housing comprising first body half and a second body halves that are secured together. The first body half has one or more half bores that extend along a length of the first body half and the second body half has one or more half bores that extend along a length of the second body half with the one or more half bores in the first body half aligning with the one or more half bores in the second body half forming one or more full sleeve-receiving bores. The fluid processing apparatus can include one or more sleeves that are securable between the first and second body halves within the one or more sleeve-receiving bores to form piston pathways within the housing for receiving pistons.

Modular fluid processing apparatuses, modular components and related methods are provided. A fluid processing apparatus for use in fluid processing systems can include a housing comprising first body half and a second body halves that are secured together. The first body half has one or more half bores that extend along a length of the first body half and the second body half has one or more half bores that extend along a length of the second body half with the one or more half bores in the first body half aligning with the one or more half bores in the second body half forming one or more full sleeve-receiving bores. The fluid processing apparatus can include one or more sleeves that are securable between the first and second body halves within the one or more sleeve-receiving bores to form piston pathways within the housing for receiving pistons.

A water purifier includes: a case including components; a cover mounted to the case to be opened and closed; a support frame mounted to the inside of the case and having at least one mounting part; a filter module detachably mounted to the case through the mounting part to filter and purify introduced raw water; a first flow path module including at least one flow path through which raw water flows and detachably mounted to the case between the case and the support frame to fix the filter module to the inside of the case; a second flow path module including at least one flow path through which purified water flows and which is connected to the components and the filter module, the second flow path module being detachably mounted to the case through the mounting part; and a faucet module mounted to the case to discharge purified water.

A water purifier includes: a case including components; a cover mounted to the case to be opened and closed; a support frame mounted to the inside of the case and having at least one mounting part; a filter module detachably mounted to the case through the mounting part to filter and purify introduced raw water; a first flow path module including at least one flow path through which raw water flows and detachably mounted to the case between the case and the support frame to fix the filter module to the inside of the case; a second flow path module including at least one flow path through which purified water flows and which is connected to the components and the filter module, the second flow path module being detachably mounted to the case through the mounting part; and a faucet module mounted to the case to discharge purified water.