An experimental study was conducted to compare between different types of coagulants and select the most suitable type in Geziret Al-Dahab water treatment plant. Five types of coagulants were applied, the first one was ferrous sulfate FeSO4 the second was ferric sulfate Fe2 (SO4)3, the third was ammonium chloride, the fourth one was ferrous chloride Fe Cl2 and the last one was aluminium sulfate (alum) Al2 (SO4)3. It was found that, the highest removal efficiency of turbidity was achieved by using aluminuim sulfate (alum). The highest removal efficiency was 77.32% at dose = 45 mg/l of initial concentration 1%. On the other hand, the lowest removal efficiency of turbidity was obtained when using ammonium chloride as coagulant. The maximum removal efficiency of ammonium chloride was 42.45% at dose = 25 mg/l. There was no significant effect on the values of total dissolved salts and conductivity of raw water when using the above coagulants.