CO2 breather filter
Demineralized water in the tank is usually exposed to carbon dioxide (CO2) from the ambient air which enters the tank via tank breather. Carbon dioxide increases conductivity of demineralized water and that may give the appearance of pollutants in the water.
Clean demineralized water has a pH of 7. If you let the ambient air enter the DM water tank, the demineralized water in the tank easily becomes acid. This occurs because carbon dioxide reacts with water and forms carbonic acid (HCO3). Carbonic acid makes the DM water acidic.
Demineralized water is free of minerals, so there is nothing to buffer the pH. If demineralized water absorbs carbon dioxide from the air, the pH of the water drops. In order to prevent forming of carbon acid in the demineralized water, one must prevent the contact of water with carbon dioxide from the air by using a CO2 breather filter. The CO2 breather filter adsorbs carbon dioxide from the ambient air as efficiently as up to 0% CO2 concentration.
Discover more about CO2 breather filter.
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