Genki balls, known in other countries as bokashi mud balls, have been proven worldwide to clean water without any chemicals, so a Hawaii Pacific University study saying they do not work is, in my opinion, incorrect. Why was this study even done? A quick internet search reveals that they do work. Jap an, Korea, Thailand, Indonesia, South Africa, the U.K., Austria and New Zealand all use bokashi mud balls to clean water. ...read more read less