Pengaruh Penambahan Kultur Mikroorganisme Em-4 Terhadap Kualitas Limbah Cair Berdasarkan Parameter Fisika dan Kimia Air: Ph dan Turbiditas: The Effect of Adding EM-4 Microorganism Culture on Wastewater Quality Based on Physical and Chemical Water Parameters: pH and Turbidity (Universitas Muhammadiyah Palu, 2026)