What makes this a good idea? It's not clear and Google translate does a pretty poor job communicating why the company believes you need these. "Finally finished!? Rice smell of bath salts!?," the site reads in a poor translation, per Dangerous Minds. "Only in about likely go three times rice fragrance to a too delicious smell, and inspiring, but fasting use caution! Too much like the stomach, it will be in trouble!!"
It doesn't say whether or not your bath water will be edible, but that last sentence should give you pause.