Nelsen 18 x 65 Filter Unit

Engineered for high-flow commercial filtration, the Nelsen 18 x 65 Filter Unit brings industrial-grade water treatment to facilities that demand consistent throughput. The system is built around the Nelsen WS2EE or WS2QC 2" control valve, a lead-free brass commercial platform with six fully adjustable cycles for tailored regeneration.

• Service flow rate of 125 gpm with a 85 gpm backwash for strong, sustained filtration
• 2" top-mount valve designed specifically for commercial and industrial applications
• Solid-state microprocessor with front-panel totalizer showing time of day, days to next regeneration, volume remaining, current flow rate, and total volume used
• Three regeneration methods: meter immediate, meter delayed, and time-clock delayed
• Optional double backwash for deeper media cleaning and improved efficiency
• Coin-cell lithium battery backup with 8-hour carryover

The 18" x 65" mineral tank arrives with commercial distributors and a supporting gravel bed, and you select the filter media that best addresses your incoming water. That flexibility lets a single platform serve as a sediment filter, an iron and manganese reduction system, a carbon taste-and-odor filter, or an acid-neutralizing bed, depending on the media you load.

Because regenerant refill draws on post-treated water and the valve uses a proven DC drive, day-to-day operation is both clean and dependable. The fully adjustable 6-cycle sequence walks through controlled backwash, down-flow brining and slow rinse, an optional second backwash, fast rinse, refill, and down-flow service, giving operators precise control over performance and salt or media efficiency. Installation is simplified by the included 12-volt AC adapter. At roughly 217 lbs configured, this Nelsen unit is a compact yet powerful choice for restaurants, car washes, light industry, and any commercial site that needs reliable, automated filtration with clear front-panel reporting.

Sizing a commercial filter correctly is critical: too small a unit chokes flow and exhausts media prematurely, while a well-matched system like this 18 x 65 holds adequate media depth to do its job and backwash effectively. Backwashing filters work by reversing flow to expand and rinse the bed, carrying captured particles to drain and restoring the media for continued service. Because the controller, distributors, gravel bed, and tank are engineered as a system, performance is predictable from startup. The Nelsen platform's open media choice also future-proofs the investment: if source-water chemistry shifts, the bed can be re-specified without replacing the valve or vessel. For installers and facility managers alike, that flexibility, combined with clear front-panel diagnostics, makes day-to-day ownership straightforward.