Sam Kharoba of First Capital Technologies, based in Baton Rouge, Louisiana, says his firm's sales have doubled in each of the past three years.

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They chose Rhode Island's plan, run by Alliance Capital, because it offered a broader range of investment options than Louisiana's plan.

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Stonehenge Capital of Baton Rouge, for example, arranges credit sales in six states other than Louisiana.

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According to an analysis by the Louisiana Department of Environmental Quality, disinfecting with ferrate required onehalf the capital investment of an ultraviolet- light-based system and onethird that of an ozone-based system.

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