The present invention features a device having a strainer cover assembly having a strainer cover with tab openings, and a strainer housing having flexible tabs arranged thereon, the flexible tabs passing through the tab openings and fastening on the strainer cover with a snap action. The flexible tabs are deflected for removing the strainer cover. The strainer cover assembly includes a strainer with a screen for filtering a medium passing through the device. The snap action of the flexible tabs makes it easy to open, slide out and clean the screen on the strainer cover assembly. The strainer cover assembly and the screen may be formed as an integral unit, which helps in cleaning the screen. In operation, the user simply compresses the snap tabs and slides out the screen which is attached to the strainer cover assembly and rinses the contaminated screen while holding it by the strainer cover assembly. The integral unit being formed by plastic mold injection. The screen may be made of stainless steel material. The strainer cover assembly may be made of a clear plastic material.

A personal air-purifying (PAP) mask includes a fan assembly; a plasma driven catalyst (PDC) assembly including an anti-microbial catalyst, wherein the anti-microbial catalyst is incorporated within a nanofiber layer of the PDC assembly; and a pre-filter, wherein the pre-filter also includes the anti-microbial catalyst incorporated therewith; wherein the PDC assembly is positioned between the fan assembly and the pre-filter, and wherein the fan assembly, the PDC assembly, and the pre-filter are within a main body of the PAP mask.

A personal air-purifying (PAP) mask includes a fan assembly; a plasma driven catalyst (PDC) assembly including an anti-microbial catalyst, wherein the anti-microbial catalyst is incorporated within a nanofiber layer of the PDC assembly; and a pre-filter, wherein the pre-filter also includes the anti-microbial catalyst incorporated therewith; wherein the PDC assembly is positioned between the fan assembly and the pre-filter, and wherein the fan assembly, the PDC assembly, and the pre-filter are within a main body of the PAP mask.

An embodiment of this disclosure provides a liquid treatment device, provided at a carbon block used for post-treating a liquid treated by the carbon block. The liquid treatment device includes: a housing; a cover; a sealing portion; a lower treatment unit; and an upper treatment unit. The liquid treatment device and the carbon block may be detachably mounted mutually, thereby enabling the liquid treatment device to be replaced independent of the carbon block. Furthermore, the liquid treatment device includes an upper treatment unit and a lower treatment unit, and a liquid inlet is provided in the housing of the liquid treatment device, thereby making distribution of the liquid flow in the carbon block more uniform.

Provided is a filter apparatus, comprising two or more filter cartridges having a first end with an inlet and screen and a second end with an outlet and screen, and walls to contain a filter media held in a housing for holding the two or more filter cartridges in about the same orientation, and an attachment clamp connected to the housing. Also provided is a housing for holding two or more filter cartridges in about the same orientation and a method of using the filter apparatus and housing.

A water treatment device can include a main body in the form of a main chamber and having an upper portion, a lower portion, a main inlet for receiving a flow of water into the main body and a main outlet for discharging a flow of water from the main body. In some embodiments an insert member disposed within the main chamber at the upper portion includes a return and bypass channel providing fluid communication between the main inlet and the main outlet. In some embodiments a filter assembly disposed within the main chamber and below the insert member includes a treatment chamber in fluid communication with the main inlet and is adapted for filtering water that flows through the filter assembly.

A rotary fluid filter including a filter body rotationally mounted within a housing. The housing having a front cap having a main fluid inlet and a backwash outlet, a rear cap having a main fluid outlet and a backwash inlet. The filter body having a front face, a rear face, and a plurality of fluid flow passages each extending through the filter body between the front face and the rear face and having a filter received in each fluid flow passage. The filter body operable to rotate with in the housing such that, for each fluid flow passage, as it is aligned with the main fluid inlet a main fluid is received therein, as it is aligned with the main fluid outlet the main fluid is discharged therefrom, and as it is aligned with the backwash inlet and the backwash outlet a backwash fluid is received therethrough.

Provided is a cartridge filter using nanofiber composite fiber yarn, the cartridge filter including: a core having a plurality of holes through which a liquid passes; and a filter medium wound around the core to collect an object to be filtered contained in the liquid, wherein the filter medium comprises composite fiber yarn in which a nanofiber web which is produced by accumulating nanofibers produced by an electrospinning method is laminated to a porous nonwoven fabric, to thus provide excellent durability and improved filtration performance.

A saturated layer stormwater filtering system with down-flow layered multimedia filters is disclosed. The filtering system may include an upflow pretreatment chamber and a subsequent filtration chamber. It also includes a snorkel pipe as an adjustable head control or internal baffles. The system incorporates gravity powered partially saturated stormwater media filters to harness the potential energy of stormwater from downspouts and pumped flows from stormwater catchments to drive the polluted stormwater in a hydraulically controlled fashion by gravity through a series of filter media layers.

Provided is a filter apparatus, comprising two or more filter cartridges having a first end with an inlet and screen and a second end with an outlet and screen, and walls to contain a filter media held in a housing for holding the two or more filter cartridges in about the same orientation, and an attachment clamp connected to the housing. Also provided is a housing for holding two or more filter cartridges in about the same orientation and a method of using the filter apparatus and housing.