I was wondering if anyone here has experience with this reaction and the proper waste disposal 

IO₃^- + 3 HSO₃^- --> I^- + 3 SO₄^-2 + 3 H⁺

IO₃^- = 8 I^- + 6 H⁺ --> 3 I₃^- + 3 H₂O

I₃^- + HSO₃^- + H₂O --> 3 I^- + SO₄^-2 + 3 H⁺

2 I₃^- + starch --> starch-I₅^- complex (blue)

I saw from something published in 1996 "For disposal of waste products, combined all of the solutions used in this experiment with solid sodium thiosulfate until the mixture is no longer blue. The resulting clear mixture can then be discarded by flushing down the drain upon the addition of water."

Mitchell, R.S. Iodine Clock Reaction. J. Chem. Educ., 1996, 73 (8), 783.

Is this still acceptable? 

Thanks 

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