Sustainable Water Treatment For Aluminum Boilers

Program Benefits


Green Chemistry

Purified tannins

Surface Protection

Multi-Metal Protection for:
Mild steel

Heat Efficiency

Maintaining or restoring your high heat efficiency

Cleaning the Loop

Slowly cleaning scale and corrosion by-products

Easier Testing

Simple, time-saving colorimetric or color comparison tests available 

Non Hazardous

Safer to handle
Non toxic
Can be sent to drain

German Engineering

Purified Tannin has been protecting heating loops since 1989 in Europe and 2005 in North America.

Beware of imitations. Tannins are complex molecules and only one program has been tested and endorsed by Patterson-Kelley.

Water Analysis in Laboratory TGWT
iPad showing PK and TGWT Water Treatment Program

About Us


Harsco Industrial Patterson-Kelley is a recognized market leader and major producer of heat transfer equipment.


Their hot water boilers and water heaters are installed in institutional, commercial, and industrial building applications such as: schools, offices, apartment buildings, dormitories, hospitals, and hotels.

Clean Technologies

TGWT, also known as The Tannin Guys®, is a leader in green chemistry, water treatment for steam boilers and closed, hot loops.

Green chemistry to improve performance without capital investment.


Learn more about the best practices

by getting in touch with our experts

Please fill your contact details below:

GET IN TOUCH: 570-534-4358


155 Burson Street, East Stroudsburg

Pennsylvania, USA 18301

Phone:      570-421-7500



  • White LinkedIn Icon
  • White Facebook Icon
  • White Twitter Icon
  • White Google+ Icon
TGWT - The Tannin Guys®


452, Jean-Neveu Street, Longueuil

Quebec, Canada,  J4G 1N8

Phone:      570-534-4358



  • White LinkedIn Icon
  • White Facebook Icon
  • White Twitter Icon
  • White Google+ Icon

© 2021 by TGWT Clean Technologies & Patterson-Kelley