Abstract: 4500-CO2 A. Introduction
1. Occurrence and Significance
Surface waters normally contain less than 10 mg free carbon dioxide (CO2) per liter, whereas some groundwaters may easily exceed that concentration. The CO2 content of a water may contribute significantly to corrosion. Recarbonation of a supply during the last stages of water softening is a recognized treatment process. The subject of saturation with respect to calcium carbonate is discussed in Section 2330.