Can you add used brita carbon filter to plant soil?

Yes, you can add used Brita carbon filters to plant soil, but it's important to first ensure that the filters are free from harmful contaminants. The activated carbon in the filters can help improve soil aeration and drainage. However, be cautious of any additional materials in the filter, such as plastic or other chemicals, which could harm the plants or soil ecosystem. It's advisable to use only the carbon and not the whole filter.