DW Series

DW SeriesString Wound Filter Cartridge

AJR Filtration proudly offers the DW Series of string wound filters, formerly sold under the Delta Pure name. DW string wound filters remove solids from water, process fluids, and compressed gasses, providing economical solutions to protect processes, people, and the environment. Theses depth filters are available with numerous material options for filter media, cores, and core covers. A wide variety of end fittings enable proper fit into most single-round and multi-round filter housings. DW cartridges are available with nominal micron ratings from 0.5 to 200 in continuous lengths from 3" to 72" and diameters from 2" to 4.5". Optional core covers assure superior particle removal for critical applications. DW string wound cartridges are manufactured in AJR Filtration's West Chicago filtration headquarters with high-speed winding machinery, producing precise diamond patterns which define the micron ratings. From pre-filtration to polishing applications, for potable water to aggressive chemicals, DW string wound filters by AJR Filtration, provide the progressive depth filtration with high sediment holding capacity demanded by the industry.



  • Wide range of materials to ensure process compatibility
  • Variety of sizes and configurations to ensure proper sizing, fit, and sealing
  • High sediment holding capacity for longer time between filter changes
  • Continuous lengths up to 72"
  • Technical support
  • Fast lead times


  • Potable water
  • Process water
  • Pre-filtration for membrane/reverse osmosis (RO) systems
  • Food and beverage
  • Chemicals, acids, bases
  • Oils, fuels, solvents
  • Plating solutions, electronics, circuit board
  • Produced water and waste, fracking 

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AJR Filtration has added string wound, melt blown, and carbon wrapped filter cartridges, formerly from Delta Pure Filtration to our product offering.  The expanded portfolio enhances AJR's position as a leading US manufacturer of high-quality engineered liquid and dust filtration products. All production and support operations continue under one roof in our West Chicago, IL filtration headquarters. Delta Pure part numbers will not change.  We look forward to serving your liquid filtration needs with more quality filter options, greater economies, and the convenience and simplicity of a single customer account. 

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