Zam Zam is 18X14 ft & 18 meter deep water well.
It started 4000 yrs ago.
Never dried since then.
Never changed the taste, no Algea or plant growth in the pond, thus no disease caused.
It was tested by European Laboratories & declared fit for drinking.
This small pond provides water to millions of people through heavy motors pulling 8000 lit: per second and after 24 hours in only 11 mins completes its level. Thus its water level never decreases