How to Maintain the Glycol in your Chiller

Have you checked the glycol solution in your chiller system lately?

At CORECHEM, we recommend checking the fluid in your chiller system annually, as part of a regular chiller maintenance schedule. Here’s how to do that:

chiller on roof
  1. First, contact us to request a fluids analysis kit! We’ll mail it to you directly.
  2. The fluids analysis kit comes with a sample collection bottle, fillable label, and instruction sheet. After collection, mail it back to us using the box it came in.
  3. You should receive your results via email within two days of our receiving your sample! See HTF Water Analysis Sample Report – System Check After Initial Fill.
  4. For a routine annual fluid check-up, your report will include the following information:
    • Glycol Concentration: What concentration do you require? Figure out the lowest temperature your system may be subjected to, to determine the desired ‘freeze point’. Then, refer to a Freeze Point Chart (below) to find your desired concentration. If your concentration is too low or high, use our Glycol Concentration Calculators to determine the correct fix. These should be straightforward to use, but if you have any questions, contact us for assistance.

Propylene Glycol Freeze Point Chart

Ethylene Glycol Freeze Point Chart

    • pH level: The pH should be ideally between 8 and 10.  If your pH is too low, you may need to add additional inhibitors, or flush and refill the system, depending on your lab results.
    • Reserve Alkalinity: Your Reserve Alkalinity measurement will help determine whether or not your fluid can be restored. If your Reserve Alkalinity is used up, your fluid’s useful lifespan is over, and you will need to flush and refill the system.
    • Additional Testing: If the initial testing of your fluid doesn’t provide a clear picture of the health of your system, or if you have specific concerns about your fluid, there are additional tests we perform. Additional tests can indicate the presence of bio-fouling or corrosion (i.e. iron or other specific metals present).
    • Suggestions: Our lab analyst gives you full recommendations for your fluid.

If you are concerned about the health of your fluid, or have any other questions about glycol / chiller maintenance, give us a call. We look forward to serving you! You can view all of our heat transfer fluids, including our GlycoChill+ glycols, HERE.

Geothermal Maintenance Made Easy

April 2, 2019

As warm weather returns, it’s time for your spring geothermal maintenance check-up!

At CORECHEM, we recommend you inspect your geothermal system at least once a year. Spring and fall are the most common times to do this. Test in the spring to look for post-winter issues; test in the fall to make sure your fluid concentration is high enough to prevent freezing.

Either way, it’s important to perform a check to detect any small issues your system may be having before they become big – and expensive.

First things first! Do an annual fluids test. A spring fluids test will help detect:

  • the presence of / potential for algae or mold growth (bio-fouling) prior to summer weather
  • the presence of /potential for corrosion
  • whether or not your fluid is ‘spent’
  • underground leaks (One good indicator of leaks is if you have red clay or excessive dirt in your geothermal fluid.)

CORECHEM is making is easy – and fast – to test the health of your geothermal system this spring! Call us today to have a geothermal maintenance test kit mailed to you. Your fluid will be tested for concentration, pH, and reserve alkalinity. Additional testing is performed as needed to further diagnose the health of your geothermal fluid. You should receive your results within 2 days of our receiving your sample!

It is also important to check:

      1. Filters. Clogged filters in your heat exchanger increase wear and tear on your pumps. (Ideally, we recommend checking these at least once a quarter.)
      2. Condensate drain. A clogged condensate drain will impede water flow – causing your pumps to work extra hard.
      3. For visible leaks.
      4. All of your heat pumps, fans, thermostat and other equipment. These should be tested to ensure they are working properly.
      5. Foliage overgrowth. Remove foliage to ensure nothing is obstructing your air intake.

At CORECHEM, we look forward to helping you bring your geothermal fluid up to speed. Call us today to discuss our geothermal fluid products including: glycols, alcohol-based fluids, and corrosion inhibitors.

Flu Shots … and Closed Loop System Checks

We all know that fall is a time to think about our flu shots, and that it is critical to maintain our health during the flu season. Have you considered checking the health of your customers’ closed loop HVAC and geothermal equipment, to ensure that it too stays healthy all season long? CORECHEM Inc. is your resource for analyzing thermal fluids, to give your customer the peace of mind that their systems contain enough antifreeze to protect from a freeze up flu.

Closed Loop System

Why Is It Important to Treat Your System with the Burst Protection Flu Shot?

Winter is once again on the brink, and just like humans, the health of your closed loops systems might suffer. CORECHEM’s GlycoChill+™ and Exo Endosol™ products provide both the freeze and corrosion resistance that your clients’ systems need to stay well all winter long.

From now until November 30, CORECHEM is offering thermal fluid analysis for any system, at no charge! Simply reach out to us at or call 800-258-5829 to have a sample kit shipped to you today. You should get your results within 2 days of the receipt of your sample!

Request a sample test

Heat Transfer Fluids

Heat Transfer Fluids

When it comes to your closed-loop system’s performance, longevity, and long-term maintenance, you can count on from CORECHEM Inc.  As a producer, we supply Heat Transfer Fluids that meet the demanding needs of a variety of industry applications including:


  • HVAC system freeze/burst/corrosion protection
  • Food industry applications
  • Process and equipment deicing
  • Process cooling and heating
  • Ice skating rinks
  • Air preheating
  • Waste heat recovery
  • Sidewalk and walkway snow melting and deicing
  • Sprinkler systems
  • Ground loop heating systems (geothermal)
  • Water chiller systems
  • Central heating systems
  • Pipeline tracing


Questions about application?  Call our heat transfer experts today to help you find the right solution.


Characteristics of alcohol and glycol-based heat transfer fluids

There are a variety of compounds that can be used in heat transfer fluids to prevent water from freezing where the temperature in the fluid is below 0°C (32°F); the most common are,

  • ethanol (ethyl alcohol)
  • methanol (methyl alcohol)
  • ethylene glycol (1,2-ethanediol)
  • propylene glycol (1,2-propanediol)
  • bio-based propylene glycol (1,3-propanediol)

The basic properties of these freeze protection fluids are listed below.

Ethanol (ethyl alcohol)
  • low corrosiveness
  • high flammability (if pure)
  • low toxicity
  • high heat transfer capacity
  • low pumping requirements due to viscosity
  • moderate cost
Methanol (methyl alcohol)
  • low corrosiveness
  • high flammability (if pure)
  • high toxicity (some states have banned the use of this product in geothermal systems)
  • high heat transfer capacity
  • low pumping requirements due to viscosity
  • low cost
Ethylene Glycol (1,2-ethanediol)
  • low corrosiveness
  • low flammability
  • high toxicity
  • low heat transfer capacity
  • high pumping requirements due to viscosity
  • higher cost
Propylene Glycol (1,2-propanediol)
  • low corrosiveness
  • low flammability
  • low toxicity
  • low heat transfer capacity
  • high pumping requirements due to viscosity
  • highest cost
Bio-based Propylene Glycol (1,3-propanediol)
  • low corrosiveness
  • high resistance to acid degradation
  • low flammability
  • low toxicity
  • low heat transfer capacity
  • lower pumping requirements than propylene glycol, due to viscosity
  • highest cost

Protection, Performance, Peace of mind…assured with our specialty heat transfer fluid line. CORECHEM Inc. is a formulator and manufacturer of heat transfer fluids, geothermal fluids and pipework system protection products serving the commercial and industrial markets.  We have a full line of products for heating and cooling applications, freeze and burst pipe protection, and deicing, defrosting and dehumidifying applications.

Questions regarding heat transfer fluids or geothermal fluids?   Call now for answers! 1-800-258-5829 –  We are your HTF/GEO fluid resource!

Matthew Werle