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Filters & Strainers.
National Line Regenerative Media Filters - [ view company brochure ]
 The National Line / ATLAS Regenerative Media Bulk Precoat System is available in 30", 42" and 48" tank diameters. The Bulk Precoat System can be used for single tank, multiple tank and/ or multiple system installations. The system comes complete with a bulk precoat mix tank, 3/4 Hp mixer, slurry transfer pump and a dry media vacuum system c/w an air operated vacuum eductor and air compressor. The filter tanks are constructed of Fiberglass Reinforced Isophthalic or Vinylester Resin (F.R.P.) and are manufactured to ASTM and ASME tank standards using molded surfaces for all critical dimensions. The tanks are totally non-corrosive and have a high gloss gel-coat finish with UV protection. The filter systems are designed for working pressures of 100 PSIG with a minimum 4 to 1 safety factor.
National Series 50 PSI Filtration System - [ view company brochure ]  Nemato National Series filter tanks are constructed of Fiberglass Reinforced Isophthalic or Vinylester Resin (F.R.P.) and manufactured to ASTM and ASME tank standards using molded surfaces for all critical dimensions. The filter systems are designed for working pressures of 50 P.S.I.G. or 100 P.S.I.G. with a 4 to 1 safety factor.The filter systems are shipped with all internal components and media dump port in a fully assembled state. All National filter designs come with uniquely placed integrally molded influent/ effluent connections (both top piped & end piped), 12" X 16" integrally molded manhole seat with internally mounted F.R.P. or F.R.P./ Clear Acrylic cover, integrally molded F.R.P. saddle supports and molded pressure gauge panel with two (2) panel mount gauges.
National Series 100 PSI Filtration System - [ view company brochure ]  Nemato National Series filter tanks are constructed of Fiberglass Reinforced Isophthalic or Vinylester Resin (F.R.P.) and manufactured to ASTM and ASME tank standards using molded surfaces for all critical dimensions. The filter systems are designed for working pressures of 50 P.S.I.G. or 100 P.S.I.G. with a 4 to 1 safety factor.The filter systems are shipped with all internal components and media dump port in a fully assembled state. All National filter designs come with uniquely placed integrally molded influent/ effluent connections (both top piped & end piped), 12" X 16" integrally molded manhole seat with internally mounted F.R.P. or F.R.P./ Clear Acrylic cover, integrally molded F.R.P. saddle supports and molded pressure gauge panel with two (2) panel mount gauges.
National Line Mini-Link, Two Valve Face Piping Kits  MINI-LINK face piping can be installed in multiple tank installations where filtered water is utilized for backwash. The face piping can be rotated 90 degrees from vertical on 34" and 42" diameter filter and 360 degrees from vertical on 60 degree diameter during installation. MINI-LINK face piping comes with single lever control linkage that is available in both manual and automatic operation. Smooth, reliable operation of the filter system is guaranteed through the use of stainless steel linkage with shoulder bolts and teflon bushings at every moving joint. The circulation pump can continue operation during backwash cycle initiation without creating water hammer due to this smooth operation. Leakage to the backwash line during filter operation is prevented through the use of a locking pin in the single lever control linkage.
National Line EZE-Flow, Four Valve Face Piping Kits  EZE-Flow face piping can be installed in single or multiple tank installations and comes with single lever control linkage that is available in both manual and automatic operation. Smooth, reliable operation of the filter system is guaranteed through the use of stainless steel linkage with shoulder bolts and teflon bushings at every moving joint. The circulation pump can continue operation during backwashcycle initiation without creating water hammer due to this smooth operation. Leakage to the backwash line during filter operation is prevented through the use of a locking pin in the single lever control linkage. Adjustment free operation of the control linkage is guaranteed through precise butterfly valve alignment with the patented Nemato Closed Cavity Bag Molding manufacturing process.
National Line Balance and Holding Tank Systems Nemato National Line balance or holding tanks can be designed to meet site specific requirements in either vertical or horizontal configurations. The tanks are constructed of Fiberglass Reinforced Isophthalic or Vinylester Resin (F.R.P.) which can be used in applications ranging from high corrosion chemical storage to food grade water retention. Each tank is manufactured to ASTM and ASME tank standards using molded surfaces for all critical dimensions and are suitable for a wide range of operating temperatures up to 80" Celsius. The tanks are totally non-corrosive and have a high gloss gel-coat finish with UV protection. The tanks can be designed for working pressures of 15 PSIG to 100 PSIG with a 4 to 1 safety factor. The tanks are shipped with all internal components and a drain port in a fully assembled state. All National Line tanks have integrally molded, with site specific orientation, of FRP or PVC vanstone flange connections. Each tank can come with an optional 12" X 16" internally mounted F.R.P. or F.R.P./ Clear Acrylic cover, externally mounted 18" F.R.P. or Clear Acrylic flanged cover, integrally molded F.R.P. saddle supports, body flanges to accommodate installation access issues. National Line Vertical Balance and Holding Tank  Nemato National Line balance or holding tanks can be designed to meet site specific requirements in either vertical or horizontal configurations. The tanks are constructed of Fiberglass Reinforced Isophthalic or Vinylester Resin (F.R.P.) which can be used in applications ranging from high corrosion chemical storage to food grade water retention. Each tank is manufactured to ASTM and ASME tank standards using molded surfaces for all critical dimensions and are suitable for a wide range of operating temperatures up to 80" Celsius. The tanks are totally non-corrosive and have a high gloss gel-coat finish with UV protection. The tanks can be designed for working pressures of 15 PSIG to 100 PSIG with a 4 to 1 safety factor. The tanks are shipped with all internal components and a drain port in a fully assembled state. All National Line tanks have integrally molded, with site specific orientation, of FRP or PVC vanstone flange connections. Each tank can come with an optional 12" X 16" internally mounted F.R.P. or F.R.P./ Clear Acrylic cover, externally mounted 18" F.R.P. or Clear Acrylic flanged cover, integrally molded F.R.P. saddle supports, body flanges to accommodate installation access issues. National Line Horizontal Balance and Holding Tank  National Line horizontal balance tanks are available in seven (7) designs. They come in 34", 42", 60", 72", 84", 96" and 120" diameter tanks. They provide a wide range of volume options ranging from 150 to 3,000 U.S. Gallons of retention in one tank. Horizontal balance or holding tanks provide a significant increase in tank surface area as compared to vertical tanks of the same volume. This increased surface area dramatically reduces water level fluctuation rates in the tank during rapidly changing bather loads in heavily used pools or spas. Tank lenths can be varied to the specific needs of each equipment room and can be manufactured from 34 in. to 30 ft. National Line horizontal tanks have integrally molded, with site specific orientation, FRP or PVC vanstone flange connections or in-board couplings when access is an issue. Each tank can come with an optional 12" X 16" internally mounted F.R.P. or F.R.P./ Clear Acrylic cover, externally mounted 18" F.R.P. or Clear Acrylic flanged cover. Along with several plumbing and access cover options, the vertical tanks are available with optional lifting lugs, flat bottom with hold down lugs, sight glass, molded F.R.P. saddle supports and stacking configurations. National Line Horizontal Balance and Holding Tank Access and Handling Solutions  National Line 34" balance and holding tanks have an exterior molded surface for control of the 34" overall outside diameter. The controlled outside diameter and lightweight modular design allows for handling without special lifting equipment. All National Line 34" balance and holding tanks can be walked through openings as small as 34" and are available in volumes up to 320 U.S. Gallons. For larger volume requirements where National Line 34" balance and holding tanks just won't work, body flanges are available for larger diameter tanks. The body flanges can be positioned to accommodate every access and installation requirement while allowing for field assembly without specialized FRP experience. National Line Maindrain Modulating Valve  The NFV-Series modulating float valve shall consist of a spool and flange body constructed of food grade isophthalic resin. The valve shall be installed on a mating horizontal companion flange discharging directly inside the balance tank. The valve shall have an imbalanced wafer type valve body. Stainless steel linkage and stop rods shall be secured to the pivot shafts located on each side of the body and shall be made buoyant by 7"0 polyethylene floats attached to a float-retaining rod. The valve disc shall be in a 20% open position with the floats up and fully open with the floats down. Available in 4" to 14" sizes. USFilter Backwash Valve - [ view company brochure ]  The Backwash Valve is a diaphragm type, hydraulically activated, two-way, three port valve. The backwash valve allows a "hands off" approach to backwashing the filter system. During the filter cycle, the valve directs water flow from the circulation pump to the influent manifold in the filter. Upon backwash activation, the diaphragm in the valve is hydraulically moved to reverse the flow of water from filter influent to tank effluent. USFilter National Line Hair & Lint Strainer - [ view company brochure ]  USFilter National NSS-Series strainers are available in nine basic influent/ effluent designs ranging from 2" to 14" with reducing configurations also available. The strainers are constructed of food grade corrosion resistant FRP, PVC and Stainless Steel materials with working pressures up to 30 psi and vacuum service up to 20" of mercury. A proprietary interlocking design between the strainer body and lid provides manual opening as well as hand tightened sealing up to 45 psi. The strainer body comes complete with FRP and PVC vanstone influent/ effluent flange connections, clear viewing window, hinged lid fastening hardware and drain/ vent plugs Through the use of a proprietary vertically pleated corrosion resistant non-welded strainer basket, the strainer produces 0-psi head loss when operating at designed flow rates. The strainer basket consist of food grade FRP end caps, 16-gauge stainless steel straining elements with 1/8" perforated holes and stainless steel connecting rods. All strainers have a minimum of a 4 to 1 open area ratio of the strainer basket to influent flanged connection, which results in longer strainer operation without excessive cleaning. Removal of the strainer basket is simplified through a proprietary design allowing for drainage of water, while maintaining strained debris retention, during lifting of the basket. All strainer baskets are self aligning during installation and come with a molded flow-indicating arrow to insure proper flow direction.
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