Need solution to remove bad smell from grey water for reuse

Hello,

I am reusing the water which was used for washing clothes & kitchen utensils. Our utility area where washing takes place is on the 2nd floor. The used water by gravity passes through sand & small stones which are in a Sintex tank in the 1st floor. This water (after passing this sieve) is collected in another Sintex tank at the ground floor. This water is further pumped to over head tank on the 3rd floor & is used for Toilet flushing.

The problem that I am facing is that the wter has a bad smell because of this the toilet area also stinks. Is there a way of removing this foul smell from water? Please suggest.

 

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