---
product_id: 258795946
title: "Dow Filmtec SW30-2521 Seawater Desalination Reverse Osmosis Membrane"
brand: "dow filmtec"
price: "$641.90"
currency: USD
in_stock: true
category: "Dow Filmtec"
url: https://www.desertcart.us/products/258795946-dow-filmtec-sw30-2521-seawater-desalination-reverse-osmosis-membrane
store_origin: US
region: United States of America
---

# Highest flow rates for max water output Handles up to 15 psig pressure drop Precision automated membrane fabrication Dow Filmtec SW30-2521 Seawater Desalination Reverse Osmosis Membrane

**Brand:** dow filmtec
**Price:** $641.90
**Availability:** ✅ In Stock

## Summary

> 💧 Turn seawater into your next power move with unmatched purity and flow.

## Quick Answers

- **What is this?** Dow Filmtec SW30-2521 Seawater Desalination Reverse Osmosis Membrane by dow filmtec
- **How much does it cost?** $641.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/258795946-dow-filmtec-sw30-2521-seawater-desalination-reverse-osmosis-membrane)

## Best For

- dow filmtec enthusiasts

## Why This Product

- Trusted dow filmtec brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Pressure Handling:** Operates seamlessly under pressure drops up to 15 psig for stable performance.
- • **Unmatched Flow Performance:** Delivers industry-leading water throughput to quench any demand, on land or sea.
- • **Certified Quality Assurance:** NSF-certified for trusted, safe conversion of seawater into pure drinking water.
- • **Ultra-Low Chlorine Tolerance:** Protects membrane integrity with <0.1 ppm free chlorine tolerance, extending lifespan.
- • **Precision Engineered Consistency:** Automated fabrication ensures flawless, reliable desalination every time.

## Overview

The Dow Filmtec SW30-2521 is a premium polyamide thin-film composite reverse osmosis membrane designed for seawater desalination. It features the highest flow rates available, precision automated manufacturing for consistent performance, and can handle pressure drops up to 15 psig. With ultra-low free chlorine tolerance (<0.1 ppm) and NSF certification, it reliably converts seawater into safe drinking water for both land and marine applications.

## Description

Dow Filmtec SW30-2521 21 inch 2 1/2 inch Sea Water Desalination Membrane

## Features

- Features highest flow rates available to meet the water demands of both land and sea based desalinates
- Improved membrane design and automated, precision element fabrication result in the most consistent product performance available
- Maximum Pressure Drop: 15 psig
- Free Chlorine Tolerance: <0.1 ppm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00D43H4XQ |
| Brand | Dow Filmtec |
| Brand Name | Dow Filmtec |
| External Testing Certification | NSF |
| External testing certification | NSF |
| Global Trade Identification Number | 00799705704053 |
| Item Dimensions D x W x H | 6.4D x 53.3W x 6.4H centimeters |
| Manufacturer | Dow Filmtec |
| Manufacturer Part Number | FILMTEC-SW30-2521 |
| Material | Polyamide Thin-Film Composite |
| Material Type | Polyamide Thin-Film Composite |
| Model Number | FILMTEC-SW30-2521 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Benefits | Converts seawater to drinking water when used in a WaterMaker or RO System |
| Product benefits | Converts seawater to drinking water when used in a WaterMaker or RO System |
| Product dimensions | 6.4D x 53.3W x 6.4H centimeters |
| Set Name | SW30-2521 |
| UPC | 701003117862 799705704053 |
| Unit Count | 1 Count |

## Product Details

- **Material:** Polyamide Thin-Film Composite
- **Product dimensions:** 6.4D x 53.3W x 6.4H centimeters
- **External testing certification:** NSF
- **Product benefits:** Converts seawater to drinking water when used in a WaterMaker or RO System
- **Brand:** Dow Filmtec

## Images

![Dow Filmtec SW30-2521 Seawater Desalination Reverse Osmosis Membrane - Image 1](https://m.media-amazon.com/images/I/717au-nBwZL.jpg)

## Questions & Answers

**Q: Is this the membrane for the Spectra Ventura 150 Deluxe Watermaker Spectra Part Number FT-MB-20**
A: Yes, this element will work for that system.

**Q: is this just a part,or the whole thing,,I do not see how this could possibly work ?**
A: Hello!  If I understand your question correctly, you're trying to determine whether this is a complete water filtration system or just a component of one.

This is the replacement membrane for a seawater desalination system.  It is a consumable part - not a stand alone system.   This is what goes inside of the white membrane housing/pressure vessels.

I hope that makes sense?

**Q: Will this fit the Katadyn Survovor 35?**
A: This will not work, search for "Katadyn 8012793"

**Q: Did anyone try this on a dessalator 60 water maker ?**
A: My friend on another boat did use this part with his dessalator.

Tip for dessalators... if you are struggling to get the end caps off the pressure vessel to get to the membrane (this part) then remove the "cage" that holds the end caps in place and just bring the watermaker up to pressure slowly.  One end or the other will pop out due to the pressure inside.

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-12*