you ' re welcome <| sep |> He ' s not going to understand . Going to have to agree to disagree here . <| sep |> One teaspoon of salt is about 6 g . Pollution are often measured in microgramcubic meter or ppm in other cases . If we say we have 10 microgramscubic meter of pollutants , then 30 , 000 cubic meters will contain 0 . 3 g of pollutants . So if it indeed cleans up one teaspoon of pollutants per day , it means it is in fact 20 x more efficient than planned ! <| sep |> Calm down . <| sep |> Part of me hoped that it ' d be some obscure Ashens video from 2007 . <| sep |> Because they can ' t ? If they could , they would . <| sep |> This is a well known theory and many professional researchers say this is probable . I personally don ' t think we all see entirely different shades of colour but instead we see just probably see slightly different shades .