Six alkaline waste materials are tested as potential filter materials for ARD treatment. The study is an ongoing project since 2.5 years on a mine waste remediation test field in opparberg, Sweden. The filters (0.5 m3) are operating under field conditions and general parameters (pH, electric conductivity, redox potential (Eh), alkalinity, acidity and sulphate) are measured immediately after sampling in a mobile laboratory. The reactive (alkaline) materials are followed by other filter materials in sequence with non-reactive support materials, to ensure iron/aluminum precipitation and trace metal sorption.