Add 1 teaspoon of artificial red food coloring (we Recommend McCormick’s Red food coloring or any artificial food coloring) for every gallon that your Berkey® System can hold into the top chamber. Place a cup under each Black Berkey® Purifier in the bottom chamber to catch the water. As long as the water in the cups does not have a red or pink hue, the purifiers are working properly.
Ensure that you do not have the Berkey PF-2™ Elements installed in the system when performing this test. This test should be performed upon initial setup and every six months after that.