4040 Membranes

4040 membranes are our second largest yet most classic RO membranes we offer, spanning 4″ wide and 40″ long, producing a permeate flow of up to 2,500 gallons per day (395 litres per hour). Like all membranes above 3″, these are constructed by spiralling layers of thin film polyamide composite membrane sheets around the central permeate collection tube and secured in a shell of high grade fibreglass.

ProWater produces this membrane in three grades to cover all applications of differing sectors, each tier boasting higher efficiency and purer product water, all at a more consistent rate.

  • Industry Competitive Stabilised Salt Rejection of <98.5% and Minimum Salt Rejection of 97%
  • Industry Competitive Permeate Production of up to 2,500gpd or 6.6lpm
  • Dual energy allows working pressure of 75psi to achieve up to 98% salt rejection & permeate flow up to 1,750gpd / 4.6lpm
  • High Active Area of 81ft² (7.5m²) Maximises Filtration Capacity
  • Optimum Operating conditions of 100psi (6.9 bar) and 25°C (77°F)


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