I would like to elaborate a concept for a package unit where 300kg sodium metabisulfite shall be dissolved in water (25% solution), the pH shall be controlled and adjusted with one of 4 liquids depending on the receipe. The metabisulfite can be bought in big bags and can be stored in a polypropylene storage tank. I was wondering what would be the best way to generate the solution? (first water than dosing of the solid sodium metabisulfite or to start with the sulfite and add water? Does anyone has some inspiring ideas for the dosing unit and the transport of the bisulfite to the stirred tank reactor?

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