In January 2017, Precision Plastic Ball implemented 100,000 shade balls in Joquicingo, Mexico. The site had excess Algae and elevated levels of contaminants. Within 2 weeks, the site was clear of Algae and saw lower levels of contaminants. Within 4 weeks, the site had even lower levels of contaminants. For a lab report please contact PPB Co., and we would be happy to share our data.