Closed Loop Water Treatment 

Chemicals are needed to avoid scale and corrosion in closed loop systems

Got closed loop and want to optimize your energy transfer without capital investment? 


Partnership for Aluminum Boilers Water Treatment

Harsco Industrial Patterson-Kelley, market leader and major producer of heat transfer equipment and TGWT, leader in green chemistry, have joined forces to put together a successfull and sustainable water treatment program for aluminum condensing boilers.  

See more details on our joint website:

Protection achieved by traditional chemistry and TGWT's tannin chemistry

Oxygen Scavenger

Corrosion Inhibitor

Hardness Stabilization


Unique benefits from TGWT's tannin chemistry without capital investment




Multi Metals Protection



Non Hazardous





Institutions: Sherbrooke University

Institutions: Sherbrooke University

Closed loop systems are treated with TG 3304, a green technology Tannin based corrosion inhibitor. We are very pleased with the services offered, and the quality of their products.

Hospitals: CHUS

Hospitals: CHUS

We have several systems treated by TGWT. From the very start of our collaboration with TGWT, we have been satisfied by services offered, their expertise, and product efficiency.

 Say Yes to TGWT and Protect your Closed Loop

Engineered Tannins allow you to target the optimized pH to get a great protection of multi-metals systems

Additional Benefits
Dosage and Automation Equipement
Great team and company
TGWT Expertise: Online Reports
Keep your heat exchanger clean
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Available Sizes: Pail, Drum & Tote
Engineered Tannin Molecule
Training on best practices
Media Coverage
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