sera KOI PROTECT 

Due to colloids and vitamins, sera KOI PROTECT ensures the protection of the mucous membrane of your precious Koi and of other fastidious coldwater fish in your garden pond. sera KOI PROTECT binds harmful metal ions. It neutralizes dissolved salts and aggressive chlorine. Furthermore, it binds floating algae and other cloudiness in the water. Your Koi will pond always stay crystal clear.