Anim Ofosu, S. ., E. . Okoh Agyemang, and S. . Wiafe. “The Use of a Model Sand Filtration System for Greywater Treatment: A Case Study of Hotels and Hostels in Eastern Region, Ghana”. Health, Safety and Environment , vol. 2, no. 8, Nov. 2020, https://sjournals.com/index.php/hse/article/view/1534.