I heard that it is recommended to replace my Berkey water after three days. Is this true if it is refrigerated?

We do recommend replacing or at least ''topping up'' your Berkey water after three days. If the water is in a cold environment, the length can be extended to a week and even a month or longer If water is kept in a Glass jug.  This is a conservative estimate for caution. The reason for this is because when you filter your water, the chemicals that inhibit bacteria growth are removed. In more humid environments, bacteria growth can occur quicker.
Shopify Plus Portugal