The purpose of adding Berkey Biofilm Drops™ to your Berkey® system is to prevent the potential growth of biofilm within the element media, which will prolong the life of your elements. Berkey Biofilm Drops™ will also help prevent potential slime (algae) growth in your tank. Using the Berkey Biofilm Drops™ will impregnate the Berkey® elements with copper, silver ions. Use no more than 4 drops per gallon of water. If you are using tap water add 2 drops per gallon once every week or two. You do not need to add the drops each time you are filling your Berkey® system with water.

If your Berkey® System is being used to filter contaminated waters such as lake, stream or river water, it is recommended that you add 4 drops per gallon of water being filtered. Further, if you are using contaminated water such as lake or stream water it is recommended to use the drops each time you fill your Berkey® system. If you are using municipal tap water it is recommended to add the drops once every week or two. This will retard or prevent the potential growth of Biofilms and prolong the life of your elements.