Those disused palastic bottles/containers are bound to be thrown out after they have been emptied i e the effervescent tablets, various kinds of vitamines, food additives or laboratory test strips etc used up, ending up in the communal waste. But they can be given yet another lease on life: they can be used, slightly adjusted as perfectly water tight vibration unit shells! Perhaps a contribution to the environment frendlier policy, only modest though,  and pushing for reduction of the final waste in our union
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