Pack of 2 gravity water filter cartridges. The cartridges are compatible with Berkey and Berkefeld water filters. Tested in France, our gravity water filter cartridges eliminate 99.999% of bacteria and impurities, offering you pure, healthy and tasty water. Details: - Materials: Activated carbon - Dimensions: 6D x 13W x 25H Characteristics: - Optimal filtration - Eliminates up to 99.999% of bacteria How to use filter cartridges - Make sure you have a gravity water filter - Install the filter cartridges in the top tank - Pour water into the top tank - Wait for all the water to drain into the bottom tank - Drink filtered water! 1% of our turnover is donated to our partner NGO working for reforestation in the Amazon.