DuPont FilmTec Eco Pro-400i 8" Brackish RO Membrane | 11,500 GPD | 99.7% Rejection | iLEC

The FilmTec Eco Pro-400i is an 8" × 40" thin-film composite brackish-water RO element designed for plants that need high rejection without high energy cost. Tested at 2,000 ppm NaCl, 150 psi, 77°F, pH 8, 15% recovery.

Key specs

• Permeate flow: 11,500 GPD (43.5 m³/d) ±15%
• Stabilized salt rejection: 99.7%
• Minimum salt rejection: 99.4%
• Active area: 400 ft² (37 m²)
• Feed spacer: 34 mil LDP (low differential pressure)
• Size: 8" diameter × 40" length (fits standard 8" vessels)
• End caps: iLEC interlocking — fewer O-ring leak paths
• Membrane: polyamide TFC
• Max pressure: 600 psi
• Max temperature: 113°F (45°C); 95°F if pH > 10
• Continuous pH: 2–11 | Cleaning pH: 1–13
• Max feed SDI: 5
• Free chlorine: < 0.1 ppm
• Max feed flow: 75 gpm
• Max ΔP per element: 15 psi

Why plants spec this element

• High rejection at 150 psi — lower pump energy than standard BW elements
• Strong silica, boron, nitrate, TOC, and ammonium rejection
• 34-mil LDP spacer cuts pressure drop and fouling impact
• Wide clean pH window (1–13) for tougher CIP
• iLEC end caps reduce coupler/O-ring leak risk vs. standard ATDs

Typical uses Industrial utility water, demineralization, boiler feed, cooling-tower makeup, municipal purification, and water reuse.

Fits standard 8" pressure vessels. Drop-in replacement for Eco Pro-400 / Eco Pro-400i style housings. Confirm vessel style (iLEC vs. standard coupler) before ordering.