The second assumption was based on different literature sources that evaluate daily water consumption in Israel to be widely different, ranging from 0.7 to 5 L per day . In our study dedicated to the Mg status of Israeli tap water , we assumed this value to be 2 L per day per capita. To support this assumption we used the data of Spungen et al., 2013 who interviewed 789 Israeli citizens from four different cities and revealed that their daily water consumption was 1943±168 mL per day per capita (average ± standard error, converted by us from U.S. cups to mL). This data shows that our assumed water intake of 2 L per day per capita is reasonable.