Raw shungit stones fraction 1-5 cm, 200 gr in a pack. 100-150gr per 1 litre of a tap normal water.
Quite often my clients ask me: "When should I change the stones? When shungit is expired?" For all these kind of questions I would like to answer the next: shungit stone, concerning the theory of it's origination from the piece of Faeton planet, is already more than 2 billiards years in our Earth planet. It means what all this "fulleren mix" is with us from quite a long time ago. And flullerens from the breed have not been swom out or dissolved, or somehow disappeared. To say more clearly: as fullerens were sitiing in shungit stones, they are still sitting there! And they are going to stay there for a long time, if only a kind of cataclizm will happen with our planet, provoking a row of reaction which will make fullerens disappear.
So, do not believe sellers who tell you to change stones from time to time. I would recommend you only to wash from time to time and to dry, becouse shungit has porosity which is able to absorb from water heavy metalls and other polluting elements. But of cource, the most beneficial properties of the rock are in it's fullerens! So, buy shungit stones without being scared what you will be cought by a kind of dependency of buying them for all your life. Only once for all! Or for creating more amount of beneficial water.
Manual: 1) wash the stones before usage 2) dry them 3) put inside of the vessel and fill with water 4) keep like that for 2-3 days
Thank you for your attention , good luck to you and strong health!)