Background and Objectives: Horizontal roughing filters (HRF) can properly remove suspended solids and microorganisms from surface water resources. especially on filtration rates less than 1. 5 m/h. This research was aimed at suspended solid removal efficiency of HRF during secondary wastewater effluent filtration. https://trendingcustomes.shop/product-category/set-of-8-snowflake-shaped-wooden-ornaments/