RTL BW8040 Commercial RO Membrane – High TDS Reverse Osmosis Element (11000 GPD)
The RTL BW8040 is a large-format commercial 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 the larger sibling to our RTL BW4040, scaled up for higher-capacity plants.
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 BW8040 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. RTL's own product label also states this membrane's technology is derived from USA-origin RO membrane technology.
Real Capacity Numbers
- RTL's official rated output: 11,000 GPD (approximately 41,640 Litres/day under standard test conditions)
- Practical field capacity: approximately 1,000 Litres/hour (1 ton) per membrane in a typical commercial plant setup
How Many Membranes Do You Need?
- 1 membrane → suitable for a plant producing around 1 ton (1,000 Litres/hour)
- 2 membranes → suitable for a plant producing around 2 ton (2,000 Litres/hour)
Capacity continues to scale with additional membranes from there — contact us to size a system for your specific tonnage requirement.
RTL BW4040 vs. BW8040 — Which Do You Need?
| Model | Size | Rated Output (RTL) | Practical Capacity | Price | Best For |
|---|---|---|---|---|---|
| RTL BW4040 | 4" x 40" | 2,400 GPD | ~250 L/hour per membrane | ₨45,000 | Smaller commercial plants (250–500L scale) |
| RTL BW8040 (this page) | 8" x 40" | 11,000 GPD | ~1 ton (1,000 L/hour) per membrane | ₨120,000 | Larger commercial and industrial plants (1 ton+ scale) |
Technical Specifications (Sourced From RTL's Official Spec Sheet & Confirmed Packaging)
| Specification | Detail |
|---|---|
| Brand | RTL (Ningbo Rixin Hengli Technology Co., Ltd) |
| Model | BW8040 |
| Series | BW — Brackish Water Desalination |
| Diameter x Length | 203mm (8.0") x 1016mm (40.0") |
| Weight | 13 KG |
| Storage Temperature | 0–40°C (32–104°F) |
| Effective Membrane Area | 400 ft² (37.2 m²) |
| Rated Water Yield | 11,000 GPD (~41,640 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.
Who This Is For
Water plant operators, commercial RO installers, and dealers building or upgrading larger-scale plants (1 ton and above) 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 1 ton (1,000 Litres/hour); two membranes suit around 2 ton (2,000 Litres/hour). Contact us for guidance on larger installations.
Q3: What is the rated output of this membrane?
RTL officially rates it at 11,000 GPD (approximately 41,640 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's the difference between this and the RTL BW4040?
Size and capacity. The BW8040 is the larger format (8" x 40" vs. 4" x 40"), rated for roughly 4-5 times the output of the BW4040 — suited to larger commercial and industrial plants rather than smaller setups.
Q5: What size housing does this fit?
Standard 8040 format — 8 inches in diameter, 40 inches in length.
Q6: What's the maximum TDS this membrane can handle?
Up to 10,000 ppm, per RTL's official specification.
Q7: What's the maximum operating pressure?
600 PSI (41 Bar).
Q8: Is delivery available across Pakistan?
Yes, nationwide delivery is available, including Karachi, Lahore, Islamabad, Rawalpindi, Faisalabad, and Multan.