



 
JJ, Since the pool holds 2000 litres of water and you are to add 2 mg of chlorine per litre you need to add 2000 2 = 4000 mg of chlorine which is 4 grams of chlorine. Grams are units of mass and millileters are units of volume and I can't convert one to the other without knowing the density of the material. Penny  


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