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The RTW Model for Corrosion Control & Process Chemistry

The RTW Model 4.0 is a spreadsheet-based tool (Quattro Pro 8® and Microsoft Excel® 5.0) designed to help users evaluate effects of chemical additions on the stability of water and predict changes in water quality parameters, such as pH and calcium carbonate precipitation potential. It can also be used to evaluate some solids that are important in water treatment. The RTW Model 4.0 will help you:

The model is available through the American Water Works Association

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