Wastewater treatment in a small Doruchów commune, Poland was markedly enhanced by the project BEST investment, a new treatment line for industrial sewage. In this small commune, industrial wastewater from local meat processing industry comprises even 80% of the total sewage. The old municipal wastewater treatment plant was too small and inefficient to handle these large amounts of industrial sewage. The new sewage treatment line was built next to the old treatment plant and it comprises biological treatment, clarification, and phosphorus filtering using calcium silicate as a filtering media. This innovative new filtering media enables full phosphorus recovery, because the spent filtering agent can be used as a fertilizer.