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| Number | Title | Issue Date |
| 7901576 | Composite water treatment vessel including liquid distributor plates The present invention provides: a distributor plate for a composite pressure vessel. The distributor plate includes a thermoplastic polymeric disk having a top side, a bottom side, a perimeter edge and a central opening. Radial slits are formed in the disk to define... | 03/08/2011 |
| 7364654 | In-home water treatment system A method and apparatus are provided for a water treatment system that includes both filtration and ultraviolet disinfection elements in a single unit. Various embodiments include a complete treatment system having replaceable filter elements or granular filter media... | 04/29/2008 |
| 7341662 | Distribution and collection headers for a filter bed A filtration vessel has an inlet for inflow into the filtration vessel of liquid media to be filtered, a body of filter media in the filtration vessel, and a drain to receive filtered liquid media for take off from the filtration vessel. The inlet is configured to i... | 03/11/2008 |
| 7288193 | Apparatus for directing fluids through a filter system A fluid distribution system for directing fluids through a filter system. The fluid distribution system ensures proper distribution of fluids during the process of filtering as well as the process of washing a filter bed. The fluid distribution system may be used wi... | 10/30/2007 |
| 7217363 | Filtration system A filtration system for cleaning a fluid, typically water, that is contained in a tank having a rounded base and which cleans, during the backwash cycle, the filter media and, in particular, cleans the media in a usually stagnant area found in the rounded base of th... | 05/15/2007 |
| 7192521 | Filter having a media retaining plate A filtration system that includes a plurality of underdrain blocks arranged to define a plurality of laterals. Each underdrain block defines an interior and an exterior and has an orifice that provides fluid communication between the exterior and the interior. The s... | 03/20/2007 |
| 7105084 | Hybrid flow pond A passive treatment system for removing metals, especially manganese, from mine drainage and other aqueous solutions. The Hybrid Flow Pond (HFP) is an open, pond-like structure utilizing a horizontal or vertical operational flow path through a bed of treatment media... | 09/12/2006 |
| 7097766 | Sand filter with rotating vanes The present invention is a media-based fluid filtration system that extends the time between backwashing operations and prevents the agglomeration of filtered particles at the top of the media bed through the use of a plurality of rotating vanes and associated tines... | 08/29/2006 |
| 7090771 | Filtration system underdrain The invention is directed to a filter underdrain for supporting a filter media between at least two dividers forming at least one cell, which includes at least one porous plate for supporting the filter media for filtering a fluid, the porous plate spanning across a... | 08/15/2006 |
| 7063787 | Filter media retaining cap and hold down grid The invention recites a filtration tank including a chamber for holding liquid to be filtered, the filtration tank includes a fluid inlet for providing liquid to the chamber. The filtration tank further includes a fluid outlet and at least one filter block disposed ... | 06/20/2006 |
| 7045067 | Method and apparatus for increasing filter contaminant loading capacity The filter contaminant loading capacity of a depth granular media filter is increased by imposing a so-called “back-slip” on the filter bed. At intervals between normal backwashing, a volume of liquid is passed upwardly through the media bed under flow condition... | 05/16/2006 |
| 6998046 | Filter system and methods of operating the same A filter system employing a modular filter and at least one high rate pre-treatment system for expeditiously and effectively filtering water. The modular filter includes a reservoir housing for containing fluid. A plurality of filter cells are disposed in the reserv... | 02/14/2006 |
| 6991726 | Filter having a media retaining plate The invention recites a filtration system including a block including a first wall and a second wall substantially parallel to the first wall. A top surface that is substantially perpendicular to the first wall is disposed between, and coupled to, the first and seco... | 01/31/2006 |
| 6977046 | Bed adsorption system The invention relates to a method of distributing a liquid in the fluid bed of an up-flow or a down-flow fluid bed reactor. The invention provides efficient distribution and plug flow like fluid flow through the fluid bed where turbulence and/or back-mixing of the f... | 12/20/2005 |
| 6972091 | Ion exchange resin plant An ion exchange resin plant for the demineralizing or softening water with an arrangement that allows the plant to operate continuously. The plant tank is divided into to two separate compartments that work simultaneously. One compartment effects water demineralizat... | 12/06/2005 |
| 6966987 | Tangentially fed media filter method and apparatus A water treatment device for purifying process water by filtration comprising a housing containing a filter media, having a bottom gravel bed and an upper silica bed, and a fluidizer for backwashing the filter media. Process water is tangentially introduced and caus... | 11/22/2005 |
| 6921481 | Automatic backwash filter system The invention is directed to an automatic backwash filter system that includes at least one influent port for introducing a fluid to the filter; a plurality of partitions forming a plurality of compartments for holding a filtering media for filtering the fluid; at l... | 07/26/2005 |
| 6919020 | Distributor/collector system A distributor/collector system includes a distributor provided with an upper header having upper laterals carrying fluid away from the upper header and a collector provided with a lower header having lower laterals carrying fluid toward the lower header. Flow enters... | 07/19/2005 |
| 6863808 | Modular water softener system A water softener system including a hard water flow pipe through which hard water flows, a modular water softener assembly, and a regeneration tank is provided. The modular water softener assembly includes an elongated tube having a first end, a second end, a length... | 03/08/2005 |
| 6841069 | High rate filter and high rate filtration method using the filter The present invention relates to the raw water-filtering technical field, and is to provide a high speed filtering apparatus which can filter a great amount of raw water containing suspended substances (SS) at a high concentration at a high speed. Floating filter me... | 01/11/2005 |
| 6773589 | Method and apparatus for removing particulate contaminants from commercial laundry waste water A filtration apparatus includes a tank having an upper chamber and a lower baffle, layers of stone and carbon between the upper chamber and the lower baffle, a water inlet to the upper chamber, and a water outlet below the lower baffle. The upper chamber is divided ... | 08/10/2004 |
| 6709574 | Fish pond filter system A system for filtering and treating waste generated or collected in the water of a fish pond. The system includes a pump, pre-filter, piping, a valve assembly, and a filter media container enclosing a plurality of discrete filter media. The filter media are generall... | 03/23/2004 |
| 6706195 | High efficiency ion exchange system for removing arsenic from water The disclosed invention is a fixed bed ion exchange system from removing arsenic from water. It employs a combination of electronically controlled process steps and specific systems configurations to duplicate the effects of moving resin beds from one operating posi... | 03/16/2004 |
| 6685826 | Fish pond filter system A system for filtering and treating waste generated or collected in the water of a fish pond. The system includes a pump, pre-filter, piping, a valve assembly, and a filter media container enclosing a plurality of discrete filter media. The filter media a... | 02/03/2004 |
| 6605211 | One-piece underdrain for swimming pool filters The present invention relates to pool filters. An underdrain design is disclosed that primarily relies on a peripheral ring rather than lateral projections to transfer the water to the sand. The ends of the ring are not joined so that the ring is not clos... | 08/12/2003 |
| 6517724 | Air charged backwashing bioclarifier The present invention provides a floating media biofilter having an economical structure which allows energy efficient and water conserving backwashing of the floating media. The biofilter includes a filter chamber fluidly connected to a charge chamber wh... | 02/11/2003 |
| 6471857 | Filter apparatus with sand filter bed A filter apparatus removes foreign substances contained in raw water by passing the raw water through a filter layer (8) made up of a particulate filter medium disposed in a filter tank (1). The apparatus is made up of: a partition wall (2) provided insid... | 10/29/2002 |
| 6447675 | Fish pond filter system A system for filtering and treating waste generated or collected in the water of a fish pond. The system includes a pump, pre-filter, piping, a valve assembly, and a filter media container enclosing a plurality of discrete filter media. The filter media a... | 09/10/2002 |
| 6428690 | Filter module with improved backwash capability A filtering system with an improved backwashing capability includes influent and effluent means, and uses plastic beads as the filtering medium. The system further includes a plurality of backwash jets that eject water under pressure at angles such that t... | 08/06/2002 |
| 6383373 | Biological filtration apparatus A biological filtration apparatus comprises: a raw water introducing section for introducing raw water as water to be processed; a biological filtration section, disposed on the lower side of the raw water introducing section, for biologically purifying/refini... | 05/07/2002 |
| 6365044 | Buoyant media filter with diffuser A water filtration system has a tank partially filled with a floating bead filtration media. A cylindrical diffuser is disposed in the tank and extends from the upper portion to the lower portion thereof. The diffuser in internally partitioned into a lowe... | 04/02/2002 |
| 6361701 | Method and device for continuous filtration of liquids The invention relates to a method and device for the continuous filtration of liquids containing solid matter, in particular for cleaning wastewater, by means of a filter bed consisting of a particulate filtering medium, which is continuously moved throug... | 03/26/2002 |
| 6325931 | Filtration system having a low profile extruded underdrain An improved underdrain block for an underdrain system supporting a filter media bed in a liquid filtration system is provided. The underdrain blocks are preferably made of an extrudable polymeric material that is extruded in relatively long sections to pr... | 12/04/2001 |
| 6287462 | Alternate sanitizer for sand filter A fluid sanitizer includes a substantially cylindrical cartridge for containing sanitizing media such as a silver bactericide. The sanitizer inserts into an existing filter in the normal filter flow path and permits filtering and backwashing. The cartridg... | 09/11/2001 |
| 6143186 | Device for continuous filtration of liquids A continuous filter device for liquids has a filter chamber that receives a granular bulk material forming a filter bed. The filter chamber has rectangular inner-walls with a liquid-permeable inlet side and a liquid-permeable outlet side positioned opposi... | 11/07/2000 |
| 6090285 | Tank treatment assembly A tank top pretreatment unit and assembly comprises a treatment unit installed inside a water treatment tank, such as a water softener tank, and in the top of the tank for treating the water either prior to its treatment with the primary treating medium i... | 07/18/2000 |
| 6059967 | Distributor device for water conditioner backflush apparatus A water conditioner includes a tank, and an apparatus for backflushing a bed of particulate material in the tank, which includes a tubular casing, a vertical tube in the casing, a cap on the top end of the casing, suitable valves for causing the flow of p... | 05/09/2000 |
| 5951855 | Filter and hydraulic mixing assembly for water treatment A filter and hydraulic mixing assembly for a water treatment system. The assembly includes two circulation tubes disposed alongside a center tube. During a backwash cycle fluid is conveyed through the center tube to a housing member where it is discharged... | 09/14/1999 |
| 5948252 | Filtering device A filtering device provided a horizontal drum in which a filter layer made of granular filter material and a space portion are formed in a vertical direction within its interior; a crude water introducing/dirty water discharging first water flow pipe whic... | 09/07/1999 |
| 5882531 | Water filtration technique using granular media A water filtration technique is designed to maximize the efficient performance of a variety of granular filtration media. The technique maintains the granular filtration media in a compacted state between a perforated outer media container and a perforate... | 03/16/1999 |
