A collar for use on a water filtration tank adapter. The collar is formed as a ring adapted to thread onto the tank connection end of the adapter and abut the nut portion between the tank connection end and the pipe end of adapter. An o-ring, square in cross-section, is disposed on a top surface of the collar, offset medially towards the center. This top o-ring is adapted to abut the nut portion of the adapter. Another o-ring, square in cross-section, is disposed on the bottom surface, offset medially away from the center. This bottom o-ring is adapted to abut the tank head upon use. Accordingly, a water-tight seal is formed at the tank connection end and tank head, the collar functioning as both a positive stop and as a substitute for pipe tape.

A membrane filter apparatus for splitting a feed into filtrate and retentate is provided. The apparatus comprises a body chamber, a feed inlet disposed on the body chamber, a retentate outlet located in the body chamber, a feed distribution tube connected to the feed inlet, and a filter assembly having a filter. The feed distribution tube has a length sufficient to cause the feed to enter the body chamber at a feed distance from the filter assembly of no greater than 50% of a total length of the body chamber. The feed flows across the filter in a direction parallel to a surface of the filter assembly. The filtrate passes through the filter assembly and the retentate flows through the body chamber in a direction antiparallel to the feed flow through the feed distribution tube and out through the retentate outlet.

A water purification filter element is provided. The water purification filter element may include a filter bottle, a filter material, an end cover, and a water self-stopping and passing structure.

An insert designed for use with a protein skimmer is disclosed. The insert includes one or more tubes that define an opening with a diameter. This diameter is designed to be smaller than the protein skimmer neck's diameter. The one or more tubes are insertable and retained by the protein skimmer neck to adjust the effective diameter of the protein skimmer neck's opening.

A dental instrument water supply filter includes a hollow cylindrical body which bounds an interior area. The interior area houses a plurality of iodinated resin particles. A pair of water permeable discs are positioned in the interior area of the body at opposed axial ends. End caps close the interior area of the body at the respective opposed ends, and each end cap includes a respective removable fluid fitting. Water that is used in connection with the operation of a dental instrument is passed through the filter. The filter provides filtration and reduces microorganisms in the water that is passed therethrough and also releases ions into the water that are effective to reduce the growth of contaminants in the water lines to the instrument.

In the invention, a sludge treatment technology adopting flocculation-horizontal drain board vacuum preloading combining multi-layer sealed geotextile bag is disclosed, which comprises sealed geotextile bags and a geomembrane for sludge grouting and filling. The sealed geotextile bag and the geomembrane have two splicing modes, one is to place a layer of geomembrane inside and close to the inner side of the sealed geomembrane; the other is to wrap and seal the outside of the geotextile with geomembrane. A horizontal drainage system for vacuum drainage is set inside the sealed geotextile bag, with one end of the horizontal drain board being connected to a vacuum drainage pipe, and the drainage pipe passes through the sealed geotextile bag via a flange and is connected to the vacuum pump used for pumping the water in the sealed geotextile bag. Sludge includes engineering waste mud, river sludge and industrial sludge. A horizontal drainage system is added inside the sealed geotextile bag and combining with flocculant for sludge dewatering, and the sealed geotextile bag can be stacked in several layers to form a stacking effect on the lower structure through the self weight of the upper layer, thus making the drainage effect faster and the dewatering efficiency higher.

A household water purifier and a filter quick knockdown mechanism thereof are provided. The water purifier includes the filter quick knockdown mechanism, and a housing. The filter included in the filter quick knockdown mechanism and the housing are connected via the filter quick knockdown mechanism. A lower end surface of the filter is movably connected with a pressing plate, and the pressing plate is configured to lift the filter and press the pressing lid of the filter quick knockdown mechanism upon disassembling the filter. The filter quick knockdown mechanism includes a first positioning mechanism and a locking mechanism. When the first positioning mechanism provided on the filter is configured to be mated with a second positioning mechanism provided on the housing, the filter is coupled with the housing via the locking mechanism.

An electrical water filter device includes a plurality of porous electrodes and one or more porous separators. Each of the one or more porous separators is interposed between two adjacent porous electrodes. A respective porous electrode includes a connection portion extending outside an edge of a porous separators next to the respective porous electrode.

A chlorinating system includes an electrode assembly comprising a plurality electrode blades, a cap electrically and mechanically coupled to the electrode assembly, and a housing for enveloping the electrode assembly in an interior compartment of the housing. The housing exposes the electrode assembly to an inlet and outlet of the housing. The cap is removable from the housing and allows for the individual replacement of single electrode blades forming the electrode blade assembly.

An ultraviolet sterilization device includes a liquid passing pipe assembly and an ultraviolet light source. The liquid passing pipe assembly includes a shell and a transparent hollow pipe, the shell is sleeved on the hollow pipe, the shell is provided with an accommodating groove. The ultraviolet light source is provided in the accommodating groove. An end of the hollow pipe is configured as a liquid inlet end, and another end thereof is configured as a liquid outlet end, and the hollow pipe is used for circulating liquid. The wall surface of the hollow pipe is covered with a reflective film, the reflective film is provided with first light transmitting holes at the position corresponding to the ultraviolet light source. The first light transmitting hole is communicated with the accommodating groove, and the reflective film is used for scattering the ultraviolet light in different areas in the hollow pipe.