NWS 21x62 Filter Unit w/Bypass

The NWS 21x62 Filter Unit with Bypass, alternate part NWTS-AFB-21, is the largest backwashing filtration platform in this Nelsen Water Treatment Solutions lineup, engineered for the highest-flow whole-house and light-commercial demands. Its broad 21-inch diameter tank holds an exceptionally large media bed, enabling robust service flow and extended runs between backwash cycles—the kind of capacity needed by properties that simply ask too much of conventional residential systems, whether due to size, occupancy, or particularly challenging water.

Like the rest of the AFB series, this unit is configured with a Nelsen 1" backwash filter valve and bypass on a polyglass mineral tank, and it ships as a hardware base so you can add the media and plumbing connections suited to your application. The generous tank volume makes it an ideal candidate for high-capacity sediment, carbon, iron, or pH-correction filtration, where smaller tanks would cycle into backwash too often to keep up with continuous high demand. Configuring it with the right media lets a single large platform address a wide range of water-quality challenges at scale.

• 21x62 mineral tank, the maximum capacity in the line
• Nelsen 1" backwash filter control valve
• Bypass valve for easy service isolation
• Designed for high-flow whole-house and light-commercial use
• Filter media and plumbing connections ordered separately
• Approximately 236.77 lbs as configured

Heavy-duty considerations

A tank this large uses a significant amount of backwash water, so confirm that both your drain and your supply can support it before installation, since an undersized drain or inadequate supply flow will undermine the backwash cycle. Choose a backwash-compatible media and program the valve cycles to match your flow rate and contaminant load for best results. Given its substantial size and roughly 236.77-lb configured weight, plan thoroughly for proper placement, structural support, access for service, and assistance during installation. The 21x62 is purpose-built for serious, high-volume water treatment in the most demanding residential and light-commercial settings. Engineered for the toughest, highest-volume jobs, the 21x62 AFB unit is the platform to specify when ordinary residential filtration simply cannot keep pace. Careful site planning ensures this flagship platform installs cleanly and performs for the long haul.