---
product_id: 94785668
title: "Max Water ULP-4040 Reverse Osmosis 4\" x 40\" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040"
brand: "max water"
price: "₩381596"
currency: KRW
in_stock: true
reviews_count: 8
url: https://www.desertcart.kr/products/94785668-max-water-ulp-4040-reverse-osmosis-4-x-40-ro
store_origin: KR
region: South Korea
---

# 2600 GPD capacity 99.35% impurity rejection ISO 9001 certified Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040

**Brand:** max water
**Price:** ₩381596
**Availability:** ✅ In Stock

## Summary

> 💦 Quench your thirst for quality with Max Water!

## Quick Answers

- **What is this?** Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 by max water
- **How much does it cost?** ₩381596 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/94785668-max-water-ulp-4040-reverse-osmosis-4-x-40-ro)

## Best For

- max water enthusiasts

## Why This Product

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

## Key Features

- • **Unmatched Purity:** Experience water like never before with a 99.35% impurity rejection rate!
- • **Durable & Reliable:** Built to last with a life expectancy of 24-36 months.
- • **Versatile Applications:** Perfect for commercial, industrial, and agricultural use.
- • **High Capacity Performance:** Produce up to 2600 gallons per day for all your water needs.
- • **Advanced Membrane Technology:** Utilizes cutting-edge TFC technology for superior filtration.

## Overview

The Max Water ULP-4040 Reverse Osmosis Membrane is a high-performance filtration solution designed for commercial, industrial, and agricultural applications. With a capacity of 2600 gallons per day and a 99.35% impurity rejection rate, this ISO 9001 certified membrane ensures optimal water quality and durability. Engineered with advanced thin film composite technology, it effectively filters contaminants while maintaining a long lifespan of 24 to 36 months.

## Description

Full description not available

## Features

- Premium Commercial Membrane: Our 4040 membrane features an impressive 90 ft² of active membrane area and an optimized 8-pound final product weight, delivering superior durability and performance over inferior alternatives. Expertly engineered by U.S. specialists, this membrane is tailored for North American water quality, ensuring long-lasting and dependable filtration.
- Optimal Purity & Performance: Achieve exceptional water quality with our ULP-4040 4" x 40" RO Membrane capable of producing UP TO 2600 Gallons Per Day, featuring a 99.35% impurity rejection rate, 600 psi Optimum Pressure: 100 psi (80-150) Salt Removal Rate: 99.20% PH levels and salt concentration < 2000 (pH 3-10) Maximum free chlorine tolerance: <0.1 ppm.
- Choosing the Right Membrane: Effectively filter contaminants like heavy metals (fluoride, lead, chromium), organic materials, and harmful minerals with a 0.0001 micron TFC membrane. Each membrane model is designed for specific water qualities, so understanding your water chemistry, pressure, and ppm is crucial for selection. Keep in mind that this membrane type is not suitable for whole-house filtration; a different setup is required for that purpose. Make sure to choose the appropriate model based on your unique water needs.
- Versatile & High Capacity: The ULP-4040 4 x 40 inch RO Membrane is designed for whole-house, agricultural, and industrial applications. This membrane delivers a robust capacity of 2,600 GPD and allows for seamless integration with industry-leading models, including Dow Filmtec AG4040FF, TW30-4040, and GE XLE-4040.
- Advanced and Improved Membrane Technology: Our labs in the United States utilize innovative thin film composite (TFC) membrane technology, engineered to provide superior performance and durability for efficient water filtration and desalination.
- ISO 9001 Certified Quality: Our ULP-4040 Membrane meets ISO 9001 standards, ensuring high-quality manufacturing processes and reliable performance for your water purification system.
- Durable & Long-Lasting: Shipped dry in a sealed package to maintain peak condition, the ULP-4040 Membrane is built for longevity, with a life expectancy of 24 to 36 months depending on water quality, temperature, and pressure. Constructed with BPA-free components, it ensures that no toxic plastic materials are used, making it safe for all water filtration needs.
- Trusted Expertise: With over 15 years in the water filtration industry, Max Water has delivered effective solutions and exceptional customer service to millions of families. Choose Max Water for reliable, high-quality filtration solutions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| External Testing Certification | ISO 9001 |
| Material Type | Polyamide Thin-Film Composite |
| Item Dimensions D x W x H | 4"D x 4"W x 40"H |

## Product Details

- **Material:** Polyamide Thin-Film Composite
- **Product Dimensions:** 4"D x 4"W x 40"H
- **External Testing Certification:** ISO 9001
- **Product Benefits:** Removes impurities for improved water quality
- **Brand:** Max Water

## Images

![Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 - Image 1](https://m.media-amazon.com/images/I/51+xFoyYEfL.jpg)
![Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 - Image 2](https://m.media-amazon.com/images/I/7159vQn7ByL.jpg)
![Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 - Image 3](https://m.media-amazon.com/images/I/81yySfmknwL.jpg)
![Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 - Image 4](https://m.media-amazon.com/images/I/71k-rDsP6iL.jpg)
![Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040 - Image 5](https://m.media-amazon.com/images/I/819voIjCcEL.jpg)

## Available Options

This product comes in different **Model** options.

## Questions & Answers

**Q: Isn't there supposed to be 2 black o rings for the membrane?**
A: As far as I know, the membrane doesn't come with o rings. If you buy the housing it does come with the o rings.

**Q: Can a 2.5" x 40 membrane be used in this housing?**
A: No only 4x40

**Q: Is this the housing only or the Membrane too?**
A: It is the housing only.

**Q: Cual es el máximo Tds de trabajo para esta membrana?**
A: Concentration of Solution - maximim 2000 ppm

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very good quality
*by A***L on July 7, 2025*

I bought these for my reverse osmosis system and it has been working with amazing results.

### ⭐⭐⭐⭐⭐ Excellent Membrane for brackish water
*by F***N on July 8, 2025*

This product is excellent i got it on time like they say and in order no damages I'm a happy customer and will purchase again and will recommend this product to family and friends

### ⭐⭐⭐⭐⭐ Excelente producto
*by G***S on July 21, 2025*

Excelente producto una maravilla en la filtración de agua

## Frequently Bought Together

- Max Water ULP-4040 Reverse Osmosis 4" x 40" RO Membrane, 2600 GPD | ULP 4040 For Water Purification Desalination Commercial, Industrial, Agricultural | Compatible with Dow Filmtec AG4040FF, TW30-4040
- lesolar 4040 Ro Membrane RO Membrane Housing 4 Inch Commercial Reverse Osmosis Membrane Housing 304 Stainless Steel Pressure Vessel 4"x40" 300 PSI 3/4" Feed and Drain Ports 1/4" Permeate Ports
- SimPure Whole House Water Filter Housing (DB10P), 10" x 4.5" Sediment Carbon Filter Universal Housing, Pre-Filtration System for Well and City Water, 1" NPT Port, Pressure Release

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.kr/products/94785668-max-water-ulp-4040-reverse-osmosis-4-x-40-ro](https://www.desertcart.kr/products/94785668-max-water-ulp-4040-reverse-osmosis-4-x-40-ro)

---

*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-22*