Consider the following statements :
(1) Pseudo-hardness is due to presence of sodium ion in water
(2) When alkalinity ≥Total hardness, Carbonate hardness in mg/l = Total hardness in mg/l
(3) Bicarbonate alkalinity = Total alkalinity – (Carbonate alkalinity – Hydroxide alkalinity)
(4) Hydroxide alkalinity = Carbonate alkalinity + Bicarbonate alkalinity
Which of the following statements related to testing of water for municipal use are correctly applicable?