SUEZ Water - Water Technologies & Water

Hytrex (Standard) / Specialty Depth Cartridge Filters

high value general purpose depth cartridge filters

The Hytrex depth cartridge filter family is an exceptional value for general applications where long life, high purity, and low change-out frequency are required. The Hytrex family is 100% pure polypropylene depth filters (including adapters), with exceptional dirt-holding capacity. The true-graded density filter matrix (lower density at the surface of the filter with progressively higher density toward the center) captures particles throughout the entire filter depth. This construction translates to longer life and fewer change-outs compared to existing string-wound or other competitive depth filters.

Hytrex and Purtrex brands are well-established world-wide with long-standing customer bases. Specialty filters Pure HiTemp and Hypure AF are quality products for high-temperature, high-pressure applications for solutions and solvents.


Hytrex (Standard)

Aquatrex LD

Aquatrex LD, a large diameter cartridge depth filter, combines innovative depth filter technology, quality, and cost effectiveness to provide excellent filtration value in residential and light commercial applications. Manufactured with our world-renowned melt-blown microfibers technology, the engineered gradient density feature of the Aquatrex LD filter provides exceptional dirt-holding capacity and unequaled life compared to our equivalent rated standard filters. With its three- to eight-times greater dirt-holding capacity and life, Aquatrex LD will reduce change-out frequency, adding more value in applications where high capacity and infrequent change outs are desired. 

  • Unique dual-graded density design of the extended media captures particles throughout entire filter media 
  • Large outer diameter of 4.5-inch filter provides more media for particulate capture and high flow rates 
  • Precision final filter results in consistent high-performance filtration 
  • Thermally bonded microfibers for high dirt retention 
  • High-purity polypropylene media has no wetting agents, solvents, antistatic agents, or binders 
  • Wide chemical compatibility 
  • Made from thermally welded microfibers of 100% polypropylene. 
  • Temperatures to 150ºF (65°C) 
  • Product ideally suited to be used in AMETEK’s Big Blue and Keystone’s Blue Giant housing units. (Big Blue is a trademark of US Filter/Siemens. Blue Giant is a trademark of Metpro Keystone Filter Division.) 
  • Made in the USA


  • Meets the requirements of the FDA Title 21 of The Code of Federal Regulations 174.5 and relevant subparts of 177. 
  • NSF 42 and 61 criteria 


Hytrex RX

Hytrex RX depth cartridge filters are engineered specifically for oil and gas applications. The Hytrex RX filter is a high-strength graded density filter with high void volume. 

  • Designed specifically for hydrocarbon capture 
  • Combines efficiency, long life, and strength 
  • Reliable and robust filter with consistent performance 
  • Wide chemical compatibility 
  • Pure 100% polypropylene construction 
  • True depth media traps particles throughout the filter 
  • Filter lengths of 33.6 and 36 inches are specific to oil and gas industry housings 
  • Made in the USA


  • NSF 42 and 61 criteria 
  • U.S. FDA 21CFR 177 food contact requirements 
  • U.S. FDA 21CFR 174.5 food contact requirements 
  • ISO 9001 criteria 



Purtrex depth cartridge filters are a patented thermally bonded filter for all-around industrial use in plating, chemical filtration, and potable water. Purtrex is an exceptional value for applications where long life, high purity, and low change-out frequency are desired. 

  • Exceptional value for general applications 
  • Progressive graded density captures particles throughout the entire filter 
  • No surface blinding (surface blinding causes flow reduction, which increases filter change outs) 
  • Inert material means broad chemical compatibility 
  • Exceptional dirt-holding capacity 
  • Pure 100% polypropylene construction 
  • No wetting agents, solvents, antistatic agents, or binders 
  • Incinerates into trace ash with no hazardous volatiles for easy disposal 
  • Made in the USA


  • U.S. FDA 21CFR 177.1520 food contact requirements 
  • Article 3 of the EU Framework Regulation No. 1935/2004/EC safety requirements 
  • EU Plastics Regulation No. 10/2011 (may be used as intended in compliant EU Member states) 
  • USP class VI-121°C Plastics criteria 
  • NSF 42 and 61 criteria 
  • ISO 9001 criteria 



Selex depth cartridge filters are engineered for critical processes in industrial applications, including microelectronics, CMP slurry filtration, and fine water filtration. Selex filters offer high particle retention efficiency similar to an absolute-rated filter. Selex also has a wide range of chemical compatibility. 

  • Absolute retention ratings for high precision filtration 
  • Fast rinse-up in high purity applications 
  • Strict quality control ensures consistent product performance and filtration quality 
  • Automated packaging for a clean finished product 
  • 100% polypropylene mircrofibers 
  • Easy disposal 
  • Wide chemical compatibility 
  • Made in the USA


  • U.S. FDA 21CFR food contact requirements 
  • NSF 42 and 61 criteria 
  • ISO 9001 criteria 



Pure HiTemp

Pure HiTemp cartridge filters are constructed of melt-blown nylon for use in extremely high-temperature and high-viscosity applications. 

  • 100% nylon media with nylon core for high strength and temperature resistance 
  • High-purity nylon media contain no resin binders, lubricants, or antistatic or release agents 
  • Melt-bonded exterior 
  • Large chemical compatibility 


  • ISO 9001 criteria 




Aquatrex LD 
  • Water Filtration 
  • Whole House Filtration 
  • Spa and Pool Filtration 
  • Restaurant and Food Service 
      • Reverse Osmosis Pre-Filtration 
      • Electronics 
      • High Purity Chemicals 
      • Potable Water Filtration 
      • Food and Beverage 
      • Food and Beverage 
      • Metal Finishing 
      • Potable Water 
      • Pharmaceuticals 
      • Oil and Gas 
      • Microelectronics 
      • Chemical Process Industry 
      • Pure Water 


      Pure HiTemp 
      • Solvents 
      • Hot, non-aqueous fluids 
      • High temperature and high viscosity solutions 
      • Paints, coatings, printing inks 
      • Fuels and lubricating oils 


        frequently asked questions 

        Download Complete Depth Filter FAQ Document

        what is the direction of fluid flow? 

        The direction of fluid flow in a depth filter cartridge is from the outside to the inside. This flow direction makes use of the greater outside diameter and surface area and allows for optimum use of the media for contaminant capture. 

        what are the temperature limits and the differential pressure limits for depth filters? 

        For non-cored (no additional plastic support core) the maximum recommended temperature is 160°F. As the temperature is increased the allowable differential pressure decreases. 

        what are the recommended flow rates and how does fluid viscosity impact flow? 

        The maximum recommended flow rates depend on the contamination of the fluid being filtered and the viscosity of the fluid. For "clean water" such as municipal water feed to an RO system the maximum flow rate is 5 gpm (18.9 lpm) per ten-inch length (TIE) of filter; e.g. a 40" filter will have 4 TIEs. 

        As the contamination level increases, flow rates should be reduced to increase service life and more effectively utilize the depth filters’ media. For moderately contaminated fluids (10 ppm of solids) a flow rate of 2.0 gpm (7.6 lpm) /TIE is suggested. 

        As fluid viscosity increases above 1 cps (i.e. the viscosity of water) the pressure drop will rise proportionately. Use the flow vs. pressure drop charts on the product fact sheet and multiply the value by the fluid viscosity to obtain the pressure drop. Size the filtration system to fall below the allowable maximum pressure drop.