When do I need to replace the Black Berkey filter elements in my system?
Use one of the 2 methods below:
Take the number of Black Berkey filtering elements in your system and multiply it by 3,000. This number will be the (Total Life) in gallons.
Estimate the average amount of water you filter through your Berkey per day. This number will be the (Total Use) in gallons.
Then simply divide the (Total Life) by the (Total Use). This number represents how many days your filter will effectively treat your water before needing to replace them.
As a reminder, with a permanent marker write the date that you calculated the need for Berkey replacement filters on the bottom of your unit..
Example: If you have a 2 filter Big Berkey and your used 4 gallons of water per day. You would multiply 2 (#of filters) by 3000 = 6000 (Total Life), then divide 6000 by 4 (total use) = 1500 days the filters will last, That's a little over 4 years!
The Black Berkey filters in your unit will never stop working. The rate that the filters produce water will slow down. This is an indication that the filter needs to be cleaned. This brings us to the second method. If after cleaning your elements they do not filter any faster; it is time to replace them.