Water Treatment Program for Aluminum Boilers

Purified Tannin

Choose the most efficient and simple water treatment program to treat multi-metal, closed loop hydronic systems

Water Quality Standards



Standards to preserve the operating efficiency of all Patterson-Kelley condensing boilers

New Standard for pH: 8.0 - 9.0

Using TGWT's water treatment program allows you to extend the pH range in your closed loop for a complete protection:

Aluminum (boiler), Mild Steel (piping) & multi-metals


R. Gaudreault, M. Dargahi; TGWT Inc.


Purified Tannin Products Available

The Product

TG 3304 PM2

Liquid form Purified Tannin
2 gallons per 1,000 gallons (2,000 ppm)
Non Hazardous

B 3304-C-STX

Solid form Purified Tannin
3 stick per 1,000 gallons
Non Hazardous

How to Measure Purified Tannin

Simple Color Comparison Test


A simple colorimetric test is needed to measure the tannins' residual in a loop

In case of product overfeed, closed loop system will be protected against corrosion as long as the targeted pH range is being followed.

More Accurate Colorimetric Test​

Different test kits suited to your needs are available

To-do By Your Operators





Residual tannin


Best practice is once a week


TGWT Patterson-Kelley Closed-Loop Test Kit


Tannin dosage and pH adjustment have to be performed to meet the targeted range

Log Book


All the values have to be registered in a log book


Every time you are running some tests


By the operator in charge of the tests


To keep a record and to make sure the program is under control​


On shut down systems, in summer for example, water re-circulation should be done:

At least 1 hr/day


To ensure continuous surface protection


Water Sampling

Day One Equipment Startup 

Water Samples from:

Water make-up

Each closed loop

Three Months

After the Startup 

Water Samples from:

Each closed loop


For highly contaminated systems, monthly analysis are highly advised

Each Year

After the Startup 

Water Samples from:

Each closed loop

Water samples should be sent to TGWT's laboratory.  This will show any significant changes in the water chemistry that could impact boiler’s operating efficiency. The lab report will allow you to correct any fluctuations in the water chemistry

Conductivity Meter TGWT


Download the lab Request Form

Send it with your samples to :



c/o Laboratory
Object: Patterson-Kelley analysis

452 Jean-Neveu Street
Longueuil, Quebec
Canada J4G 1N8



Talk to our experts to keep your high heat efficiency in your aluminum condensing boilers

Please fill your contact details below:

GET IN TOUCH: 570-534-4358


155 Burson Street, East Stroudsburg

Pennsylvania, USA 18301

Phone:      570-421-7500

Email:       pkboilersales@harsco.com

Website:   www.pattersonkelley.com

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TGWT - The Tannin Guys®


452, Jean-Neveu Street, Longueuil

Quebec, Canada,  J4G 1N8

Phone:      570-534-4358

Email:       ALboilers@tgwt.com

Website:   www.tgwt.com

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© 2021 by TGWT Clean Technologies & Patterson-Kelley