FilmTec seawater RO membranes
We supply 8-inch FilmTec (DuPont) seawater elements for partial or full replacement, together with interconnectors, O-rings and brine seals. Before quoting we check that the requested model matches the one installed in your train.
WhatsApp: +34 655 099 909Updated: September 2026
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Models we supply
| Model | Used for |
|---|---|
| SW30HRLE-440 / -400 | High rejection with low energy, for medium- and high-salinity seawater. 28-mil feed spacer. |
| SW30XHR-440 | Very high salt and boron rejection, where permeate quality is the constraint. |
| SW30XLE-440 / -400 | Low energy consumption. |
| SEAMAXX-440 | Very high permeability, for plants where energy is the largest cost. |
An i at the end of the model (for example SW30HRLE-440i) means iLEC interlocking end caps. If your plant uses iLEC elements, replacements must match.
Reference data: SW30XHR-440
| Parameter | Manufacturer's value |
|---|---|
| Active area | 41 m² (440 ft²) |
| Permeate flow | 25 m³/d (6,600 gpd) |
| Stabilised salt rejection | 99.82% (minimum 99.7%) |
| Stabilised boron rejection | 93% |
| Test conditions | 32,000 ppm NaCl, 5 ppm boron, 55 bar, 25 °C, pH 8, 8% recovery |
| Maximum operating pressure | 83 bar (1,200 psi) |
| Maximum temperature | 45 °C |
| Maximum pressure drop per element | 1.0 bar (15 psi) |
| Free chlorine | < 0.1 ppm |
| Maximum feed SDI | 5 |
Source: DuPont — FilmTec SW30XHR-440 data sheet, DuPont — FilmTec SW30HRLE-440, DuPont — FilmTec SEAMAXX-440 data sheet.
What fails and what gets replaced
| Symptom | Usual cause | What to do |
|---|---|---|
| Differential pressure rises in lead elements | Biological or colloidal fouling | Clean first; replace if the element does not recover |
| Normalised flow drops in tail elements | Scaling | Acid clean; replace if it does not recover |
| Salt passage rises across the train and cleaning does not help | Membrane oxidation by chlorine or other oxidants | Replace elements and correct dechlorination |
| High conductivity from one vessel only | Leaking interconnector or O-ring | Interconnectors and O-rings; probing the vessel locates the leak |
| Elements deformed or displaced (telescoping) | Excessive pressure drop | New elements, and a check of the vessel's spacers and bearing plate |
Partial or full replacement
Placing new elements next to used ones in the same vessel changes the flow distribution. For partial replacement we ask for the installed model and the positions being replaced. If the installed model has been discontinued, we say so and give the manufacturer's replacement; it is worth confirming with a projection in DuPont's WAVE software.
Storage and transport
Some models ship wet, in preservative solution, and others dry. Tell us which your plant uses. In transit and storage, membranes must be protected from freezing and direct sunlight.
What we need to quote
- Installed model, as printed on the element label.
- Quantity and, for partial replacement, the position of each element.
- For a model change: feed water analysis and operating data.
- Interconnectors, O-rings or brine seals, listed separately.
- Delivery country and address.
Have the equipment nameplate to hand?
Send a photo or the part number. We check the model and reply within 4 business hours.
Related pages
Frequently asked questions
Do you sell single elements?
Yes. We quote from one element to a full train replacement.
Do you supply interconnectors, O-rings and brine seals?
Yes, separately or with the elements.
Can I switch from SW30HRLE to SEAMAXX to save energy?
It is possible, but it changes operating pressure and permeate quality. Validate it with a manufacturer projection before buying.
Are the membranes genuine?
Yes, genuine DuPont FilmTec, bought through its distribution channels.