Setyowati, Elly, and Indasah Indasah. 2021. “Optimization of Local Materials in the Water Purification System As an Effort to Reduce Iron Content in Water Sources ‘Sumber Lestari’ in the Manduro Village, Jombang District”. Journal for Quality in Public Health 4 (2):136-42. https://doi.org/10.30994/jqph.v4i2.201.