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Recycling cooling water is a primary method for extending existing water supplies and is often limited by formation of silica scales. A series of experiments was conducted to evaluate the technical and economic feasibility of the ultra-high lime process for removing silica from recycled cooling water. These experiments used a bench scale continuous flow reactor system with automatic control of reactor pH and flow. Experiments were conducted over a range of values of pH (pH 10.9 to pH 12.1), temperature (25, 35, and 45 degs C), hydraulic retention time (2 to 64 minutes), and solid retention time (2 to 425 minutes). Results of these experiments showed that the ultra-high lime process is technically and economically feasible. Good silica removal was observed at hydraulic and solid retention times below those typically employed in conventional lime softeners.