Puritech String Wound Filter Cartridges

Puritech String Wound filter cartridges are a kind of deep filter cartridge, which is made from the textile fabric string (polypropylene, absorbent cotton and so on) preciously winding onto the multi-hole axies according to the specific technology. Puritech string wound filter cartridge that design for SWRO/BWRO can greatly reduce equipment operating costs and excellently protect your RO components. The all polypropylene construction provides excellent compatibility in a wide variety of process streams.

Features and benefits

  • Graded density structure:
    • Higher contaminant holding capacity
    • Selective entrapment of contaminant throughout the filter to maximize lifetime
  • Homogeneous and fluffy raw material
    • Lower pressure drop for higher flow rates
    • High product throughput for extraordinarily long service life
  • Robust cartridge construction
    • Better performance in harsh environments
    • Wide range of sizes and precision
  • Chemical inertia components
    • Compatible with a wide range of solvents and cleaning solutions
  • Components free of adhesives and surfactants
    • Very low extractable levels
    • Board chemical compatibility for most aggressive process applications


  • Filter Medium:        Polypropylene/Cotton
  • Outer Diameter:     63 mm
  • Inner Diameter:      28 mm / 30 mm 
  • Core: Reinforced Polypropylene, 304 Stainless Steel, 316 Stainless Steel
  • End Caps: Polypropylene
  • Sealing:                    Silicon, EPDM, NBR, Viton

Recommended Operating Conditions:

  • Maximum Temperature:    Polypropylene: 176℉ (80℃), Cotton: 248℉ (120℃) 
  • Maximum Pressure:       61psi (4.2bar) @ 68℉ (20℃)

Typical Application:

  • SWRO/BWRO desalination plant
  • RO pre-filtration
  • UF pre-filtration
  • Chemical solvent filtration
  • Food and Beverage Processing
  • Reinjection Water (Oil & Gas)