I purchased an Eheim eXperience 250 filter for my aquarium however i couldn't find any suitable way to use carbon inside of the filter.

This simple print replaces one of the blue sponges on the lower media basket and allows you to fill it with activated carbon. SImple as that!

To install it into the filter, you have to lift up the handle on the media basket, remove the little rubber sealing cap on the pipe that is part of the media basket, slide in the print & finally re-install the rubber sealing cap, done!