RTL BW4040 Commercial RO Membrane – High TDS Reverse Osmosis Element (2400 GPD)
The RTL BW4040 is a commercial-grade reverse osmosis membrane built for demanding water conditions — specifically, areas with heavy TDS (total dissolved solids) where standard membranes run short on lifespan and lose efficiency. It's our recommended membrane for exactly these tougher installations.
Built for High TDS Water
Standard RO membranes are designed around lower-TDS feed water. When fed water with heavy dissolved solids, they tend to wear out faster and produce water less efficiently over time. The RTL BW4040 is a BW-series (Brackish Water) membrane, engineered and rated by the manufacturer to handle feed water with salt content up to 10,000 ppm — well above what standard membranes are built for — while maintaining a high removal rate for difficult substances like soluble salts, TOC (total organic carbon), and silica. If you're installing or upgrading a plant in an area with known heavy-TDS water, this is the membrane built for that job.
Real Capacity Numbers
- RTL's official rated output: 2400 GPD (approximately 9,085 Litres/day under standard test conditions)
- Practical field capacity: approximately 250 Litres/hour per membrane in a typical commercial plant setup
How Many Membranes Do You Need?
- 1 membrane → suitable for a plant producing around 250 Litres/hour
- 2 membranes → suitable for a plant producing around 500 Litres/hour
For larger installations, membranes scale up from there — contact us to size a system for your specific capacity requirement.
Technical Specifications (Sourced From RTL's Official Spec Sheet)
| Specification | Detail |
|---|---|
| Brand | RTL (Ningbo Rixin Hengli Technology Co., Ltd) |
| Model | BW4040 |
| Series | BW — Brackish Water Desalination |
| Diameter x Length | 102mm (4.0") x 1016mm (40.0") |
| Weight | 3.5 KG |
| Storage Temperature | 0–40°C (32–104°F) |
| Effective Membrane Area | 90 ft² (8.4 m²) |
| Rated Water Yield | 2400 GPD (~9,085 Litres/day, RTL test conditions) |
| Max Feed Salt Content | Up to 10,000 ppm TDS |
| Max Operating Pressure | 600 PSI (41 Bar) |
| pH Tolerance | 2–11 |
| Minimum Desalination Rate | 99.5% |
| Stable Desalination Rate | 99.6% |
| RTL Test Conditions | 2000ppm NaCl, 225 PSI, 25°C, pH 8.0, 15% recovery rate |
About RTL
RTL is a brand of Ningbo Rixin Hengli Technology Co., Ltd, a Chinese manufacturer established in 2016 and based in Cixi City, Zhejiang Province. They're recognized as a national high-tech enterprise, hold 30+ patents, and operate a dedicated R&D facility developing their own RO base film technology — a step most membrane sellers don't take, since most rely on imported base film.
Who This Is For
Water plant operators, commercial RO installers, and dealers building or upgrading systems in areas with known heavy-TDS water — municipal supplies, groundwater, or borewell sources where standard membranes have shown short lifespans or declining output.
Frequently Asked Questions
Q1: What makes this membrane different from standard RO membranes?
It's built specifically for high-TDS water. RTL rates it for feed water salt content up to 10,000 ppm, with a high removal rate for hard-to-treat substances like soluble salts, TOC, and silica — conditions where standard membranes typically lose efficiency and wear out faster.
Q2: How many membranes do I need for my plant?
As a general guide: one membrane suits a plant producing around 250 Litres/hour; two membranes suit around 500 Litres/hour. Contact us for guidance on larger installations.
Q3: What is the rated output of this membrane?
RTL officially rates it at 2400 GPD (approximately 9,085 Litres/day) under standard test conditions. Practical field output — what you'll actually see in a working plant — runs lower than this lab rating, which is normal for real-world operation.
Q4: What size housing does this fit?
Standard 4040 format — 4 inches in diameter, 40 inches in length.
Q5: What's the maximum TDS this membrane can handle?
Up to 10,000 ppm, per RTL's official specification.
Q6: What's the maximum operating pressure?
600 PSI (41 Bar).
Q7: Is delivery available across Pakistan?
Yes, nationwide delivery is available, including Karachi, Lahore, Islamabad, Rawalpindi, Faisalabad, and Multan.