Ishak, Ishak, Minarni Rama Jura, Irwan Said, and Sri Hastuti Virgianti Pulukadang. 2022. “The Hardness and The Testing of Acidity (pH) on The Groundwater in Mapane Tambu Balaesang District, Donggala Regency”. Media Eksakta 18 (2):102-7. https://doi.org/10.22487/me.v18i2.2345.