Z amzam water research Studies conducted on the chemical composition of Zamzam water are conflicting especially for arsenic. Therefore, the aim of our study is to study the composition of tap and bottled Zamzam water and to compare its quality according to international guidelines for drinking water. ( zam zam water benefits ) Six Zamzam tap water samples as well as one bottled sample were analyzed according to standard methods (APHA) for their chemical constituents (pH, TDS, Na, K, Mg, Ca, Fe, Cu, Zn, Cd, Pb, Mn, Al, As, Cl − , SO 4 −2 , HCO 3 - and PO 4 −3 ). The results were compared to the guidelines of WHO and EPA for the quality of drinking water. All analyzed parameters were below the maximum allowable limits (MAL) of WHO and EPA ( p ˃0.05) , except TDS . ( Zamzam water analysis ) The average values of TDS (814 mg L −1 in tap Zamzam water samples and 812 mg L −1 in bottled samples) were below the MAL of WHO (1000 mg L −1 ) ...