The TM720D-400 is a Toray reverse osmosis (RO) membrane widely used in commercial and industrial water purification systems. It's built to remove dissolved salts, bacteria, viruses, and other impurities from water, and is available directly from Pearl Water at our TM720D-400 product page.

Whether you're upgrading an existing RO system, speccing a new industrial plant, or comparing membrane options, this guide covers the TM720D-400's real specifications, applications, and how it stacks up against other membranes in Toray's line.

Table of Contents

1. What Is the TM720D-400 RO Membrane?

2. Key Features

3. Technical Specifications

4. Common Applications

5. Advantages and Trade-offs

6. TM720D-400 vs Other Toray Membranes

7. How to Choose the Right Membrane

8. Practical Usage Tips

9. FAQs

What Is the TM720D-400 RO Membrane?

The TM720D-400 is a Toray brackish water reverse osmosis membrane in the standard 8040 format (8-inch diameter, 40-inch length), designed for high-efficiency water purification. It's suitable for:

• Commercial and light industrial RO plants

• Municipal water treatment

• Bottled water production

• Larger residential systems requiring bulk purification

Key Features

1. Strong salt rejection — 99.7% nominal rejection rate, removing dissolved salts and contaminants

2. Thin-film composite construction — cross-linked, fully aromatic polyamide, the standard material for high-performance brackish water membranes

3. Standard 8040 sizing — fits existing standard pressure vessels without custom housing

4. Wide application range — suitable for commercial, municipal, and industrial-scale systems

Technical Specifications

Note on recovery rate: the 15% figure above is the single-element test-condition recovery, the standard way manufacturers rate individual membranes. A full multi-element system array can achieve much higher overall recovery (commonly 50–75%) through staged design — that's a system-level outcome, not a single membrane's own spec, so don't confuse the two when sizing a plant.

Common Applications

1. Commercial RO plants — offices, restaurants, hotels

2. Industrial purification — factories, laboratories, bottling plants

3. Municipal water treatment — community and small-scale municipal setups

4. Larger residential/housing society systems — where domestic-scale membranes aren't sufficient

Advantages and Trade-offs

Advantages:

• High, consistent salt rejection (99.7% nominal)

• Standard 8040 format fits widely available housings

• Long service life with proper pre-treatment

• Suitable across commercial and industrial scales

Trade-offs:

• Requires proper pre-filtration (sediment and carbon stages, or industrial-grade equivalents) to maintain rated performance

• 600 PSI maximum pressure rating means your pump and housing must be correctly matched

• Sized for commercial/industrial use — overkill for a single home purifier, where a domestic RO membrane is more appropriate

TM720D-400 vs Other Toray Membranes

Rather than comparing against generic, unnamed "standard" and "high-capacity" categories, here's how the TM720D-400 actually compares to other real Toray 8040 membranes Pearl Water stocks:

The TM720D-400 is the general-purpose choice among these — pick TMG20D-400 if you need higher flow at similar rejection, TML20D-400 if your feed water is prone to fouling, or TM820V-400 only if you're treating actual seawater, since it operates at a much higher pressure rating that a brackish water system doesn't need.

How to Choose the Right Membrane

1. Check housing compatibility — confirm your system uses standard 8040-format pressure vessels

2. Match to your feed water's TDS and fouling potential — see the comparison table above

3. Buy from a verified distributor — to ensure a genuine Toray membrane, not a counterfeit

4. Confirm your pump and housing are rated for up to 600 PSI

5. Budget for pre-treatment — a membrane is only as good as the sediment and carbon stages protecting it

Practical Usage Tips

• Pre-filter water to prevent premature clogging and scaling

• Follow manufacturer installation guidelines exactly — improper seating reduces rejection performance

• Periodically flush the membrane per Toray's maintenance schedule

• Monitor output TDS regularly with a TDS meter to catch performance drop-off early

• Replace based on actual performance decline, not just a fixed calendar date — feed water quality affects real service life significantly

FAQs

1. What is the TM720D-400 used for?

It's used in commercial and industrial RO systems to purify brackish water by removing dissolved salts, bacteria, and other impurities, achieving 99.7% salt rejection.

2. What is the maximum operating pressure of the TM720D-400?

600 PSI (4.1 MPa) — significantly higher than domestic RO membranes, reflecting its commercial/industrial design.

3. What's the difference between the TM720D-400's "recovery rate" and a full system's recovery?

The membrane's own rated recovery (15%) is a single-element test figure. A full system with multiple membrane elements staged together can achieve much higher overall recovery, commonly 50–75%, through proper array design — that's a system engineering outcome, not something the membrane alone provides.

4. How is the TM720D-400 different from the TMG20D-400?

Both are 8040-format brackish water membranes with 99.7% rejection and 600 PSI max pressure, but the TMG20D-400 has a higher rated flow (12,100 GPD vs 10,200 GPD).

5. Where can I buy a genuine TM720D-400?

Directly from Pearl Water's TM720D-400 product page, backed by a 1-Year Warranty.

6. Does the TM720D-400 need pre-filtration?

Yes — sediment and carbon pre-treatment stages protect the membrane and are essential to achieving its rated performance and service life.