IS STAINLESS STEEL SAFE TO USE?

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It is really not recommended to store or ferment your kefir in a metal container. Acidic foods can cause the metals to leach when contact is prolonged. Briefly using a spoon or strainer will probably not do harm if you are using 304 Stainless steel. 304 Stainless Steel is safe to use, other metals like iron, tin, copper or aluminum is not safe to use.