In this study, the effect of the filtration process using filters from one of the leading European producers on Na, K, Mg, Ca, Fe and Zn concentration in water was investigated. The increase in Na (up to 300%) and K concentration (up to 320%) at the beginning of jug filter usage was reported. A decrease in Ca, Fe and Zn concentration was observed. Standard filters remove 80–90% of Mg from tap water at the beginning of the usage, while magnesium-enriching ones slightly increase its concentration – from around 8 to 12–25 mg/L. Significant changes in the filter's operating characteristics were also observed for other studied elements as they wore out. Using Mg-enriching filters can increase magnesium intake from 4–5 to 6–15% of the recommended daily dose from water consumption. The results were also discussed regarding the amounts of macroelements found in commercially available bottled water. The magnesium concentration in tap water after filtration through magnesium-enriching filters was lower compared to bottled mineral waters. The authors note a scope for the development of water filter production technology, in particular, the need to develop filters that more efficiently enrich water with magnesium and do not increase sodium concentration.

  • The influence of popular water filters on the concentration of Na, K, Ca, Mg, Zn and Fe in water was examined.

  • Studied filters can increase Na and K and decrease Ca, Fe and Zn concentrations in water.

  • Mg-enriching filters can only slightly increase the concentration of this element in water.

  • Studied filter performance changes rapidly as the filters wear out.

  • The development of more efficient Mg-enriching filters is desirable.

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