Insulated bottle filter or nomadic flask. I filter my water anywhere at any time! an ecological and economic gesture. Set of 4 portable water bottle filters with super activated vegetable charcoal. Activated carbon purifies water by attracting residues of heavy metals, pesticides, chlorine... to capture them in the pores. Quick and easy to use. 100% natural, certified by ECOCERT France. Ingredient: recycled coconut shell activated carbon (Indonesia) B.E.T adsorption area: 1200m2/g Pyrolysis and activation in France Packaging in France corn fiber filter Weight: 15g X 4