36.9% SiO₂, 15.5% Na₂O and 47.6% H₂O to 2.24 L of 2N NaOH solution and mixing for 10 to 15 minutes at ambient temperature, dissolving commercial sodium aluminate powder to get

sodium aluminate solution containing 120-130 g Na₂O/L and 100 to 104 g Al₂O₃ /L and adding caustic soda in water followed by the addition of sodium aluminate solution into the

sodium silicate solution at ambient temperature within 60 to 100 minutes, with constant addition rate and continuous stirring to form aluminosilicate gel having the composition 3.2-3.3

Na₂O : 1.0 Al₂O₃ : 1.75-1.85 SiO₂ : 90-95 H₂O, subsequently the entire reaction mixture is stirred at a temperature of 90-95⁰C for 45 to 75 minutes, cooled and the crystalline product is

filtered off, washed to remove excess alkali and dried to obtain detergent grade zeolite which has composition 0.9-1.0 Na₂O : 1.0 Al₂O₃ : 1.75-1.85 SiO₂ : 4.5 H₂O with uniform and small

(50% < 4?m) particle size and calcium binding capacity of at least 275 mg CaCO₃ /g zeolite.