Melt filtration is a well-established melt treatment procedure in steel and aluminum casting to improve the cast quality. For this purpose, various ceramic filter materials are used, with carbon-bonded alumina prevalently used in steel melt filtration. Several factors are considered when evaluating the suitability of a filter material such as the interaction between the melt and filter material, the filter’s thermal stability, and its thermal shock resistance. This study aims to investigate the properties and behavior of carbon-bonded alumina in copper melt filtration. The wetting and chemical interactions of carbon-bonded alumina with the copper melt were characterized by sessile drop tests and post-mortem SEM/EDX analysis. Additionally, the filtration behavior was evaluated with the help of sand-casting trials. It was found that copper does not wet carbon-bonded alumina and that no interaction occurs under vacuum and argon atmospheres. Investigation of the solidified metal cast with the filters shows pores in the copper surrounding the carbon-bonded filters, a product of the reaction between the melt and the carbon-containing filter surface.