Bi-Yearly Maintenance for HUG Hydronics Systems with Antifreeze

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Check your Glycol bi-yearly by using a pH test strip. Just dip it into the liquid in the tank, Read it by comparing the color to the chart with the test strips.

The pH level should range between 8.0 and 10.0.

Any fluid with a pH below 7.0 should be replaced. 

For fluids between 7.0 and 8.0, adjustments can be made using a 50 percent solution of sodium hydroxide or potassium hydroxide. HUG Hydronics will soon offer pH adjustment kits for quick and easy use.

Every 3-5 years the glycol degrades enough that it will have to be completely replaced. You will know it is time if the pH is lower than 7.