Optimization of Laundry Wastewater Treatment Using Zeolite and Activated Carbon Media in a Compact Dual-Tube Combination Filter: Optimalisasi Pengolahan Air Limbah Laundry menggunakan Media Zeolit dan Karbon Aktif dalam Filter Kombinasi Dua Tabung Kompak. SPECTA Journal of Technology, v. 9, n. 3, p. 303–314, 31 Dec.2025.