Rachmawati, Ahmad Misbakhus Sururi, Idah Diana Wati, and Ani Sa’adah, “Utilization of Biomass Extraction Waste for Filter Cartridge Production to Improve Water Quality Based on Total Alkalinity and Total Hardness Parameters”, Proceeding Int. Jt. Conf. UNESA, vol. 3, no. 1, Nov. 2025.