Jumiati, Ety, 		Nasution, Nazaruddin, AND 		Prananda, Dika.
" Reducing Mn Levels from Bore Well Water in Tembung Village by Filtration of Tea Bag Activated Carbon, Zeolite, Silica Sand and Gravel" <em>BULETIN FISIKA</em> [Online], Volume 24 Number 2 (5 August 2023)