FilmTec™ SW30-4040 is DuPont’s workhorse 4" seawater reverse osmosis element for marine watermakers, offshore platforms, and small-to-medium SWRO systems. With 99.4% stabilized salt rejection at up to 1,000 psi operating pressure, it converts full-strength seawater (up to ~45,000 ppm TDS) into potable water. It is the recommended substitute for the discontinued SW30HRLE-4040.
Fits standard nominal 4" × 40" pressure vessels — used across the ForeverPure SWRO watermaker range.
| SKU / Model | SW30-4040 |
| Product Type | Seawater Reverse Osmosis Membrane Element |
| Replaces | FilmTec SW30HRLE-4040 (discontinued) |
| Permeate Flow | 1,950 GPD (7.4 m³/d) at test conditions |
| Active Membrane Area | 82 sq. ft. (7.6 m²) |
| Stabilized Salt Rejection | 99.4% |
| Test Conditions | 32,000 ppm NaCl, 800 psi (55 bar), 77°F, 8% recovery |
| Max Operating Pressure | 1,000 psig (69 bar) |
| Max Operating Temperature | 113°F (45°C) |
| pH Range | 2–11 continuous; 1–13 short-term cleaning |
| Element Dimensions | 3.9" dia. × 40" L (fits nominal 4" pressure vessels) |
| Manufacturer | DuPont Water Solutions (FilmTec™) |
| Shipping Weight | ~12 lbs (boxed) |
| Shipping Dimensions | 6" × 44" × 6" (boxed W × L × D) |
| HS Code (Tariff) | 8421.21.0000 — water filtering/purifying apparatus |
| Warranty | 1-Year materials & workmanship; 3-Year prorated performance warranty from DuPont (commercial elements, per DuPont conditions) |
