The card contains no comparison with charcoal filters. It calls shungite a “universal sorbent”; the effects on water (removal of impurities, taste) are described in the manufacturer's text, but the card gives no test methods or results. Use 2–3 l of water per 150 g of shungite.
General information (not a manufacturer's claim): the result of purification depends on the material and the conditions; the quality of drinking water is more reliably judged by analysis and certified filters.