ไกรวุฒินันท์ ป. and โลราช อ. (2015) “The Efficiency of Filter Media Used in Trickling Filter in Wastewater Treatment”, KKU Science Journal, 43(2), pp. 260–266. available at: https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249374 (accessed: 27 August 2026).