In granitic regions, waters are weakly mineralized, with high concentrations in
carbon dioxide, because of insoluble and hardly hydrolysable soils. These acidic waters are
considered as agressive and must be treated by filtration on limestone materials to reach
calco-carbonic equilibrium. Marine and terrestrial limestone materials are usually used but
the company, Usine de Kervellerin, wants to develop a new remineralization opportunity by
using a shell co-product. Semi-industrial scale tests were thus conducted directly on water
treatment plants, in Couzeix and Ambazac. The reactivity and efficiency of the shell coproduct
were comparable to usual materials for contact times between 15 and 20 minutes. | 
