Duplex water filtration systems using Pentair FRP vessels come in various sizes such as 10×35, 13×54, 16×65, 18×65, 21×60, 24×65, 24×72, 30×60, 30×73, 36×72, 42×72, 63×67, and 63×86. These systems feature top and bottom opening flanges or manways ranging from 1" to 6" to accommodate different installation needs. They are designed for both single and duplex operations, providing flexibility based on water purification requirements. Equipped with Clack control valves from the USA, these systems offer automatic backwash capabilities, ensuring efficient maintenance and prolonged filter life. They support a service flow ranging from 0.5 up to 333 gallons per minute, making them suitable for a wide range of flow rates in industrial, commercial, and municipal applications. The duplex configuration ensures continuous water supply by alternating between filtration units, allowing one to remain operational while the other undergoes maintenance or regeneration, thereby minimizing downtime and ensuring uninterrupted access to clean, treated water.