en2015-08-18 18:07 PM CESThttp://inspire.ec.europa.eu/codelist/CommodityCodeValue/shellGrit:1http://inspire.ec.europa.eu/codelist/CommodityCodeValue/shellGritShell grit is coarsely ground or broken seashells. It is used, among other things, by birds as a source of calcium for egg shell production, and to aid digestion. - http://en.wikipedia.org/wiki/Shell_grit