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Waangsir, Ferry WF and Arnawa, I Gede and Sadukh, Johanis JP (2023) OPTIMIZATION OF THE HARDNESS OF CLEAN WATER SOURCES WITH VARIOUS TREATMENT PRINCIPLES TO OBTAIN SOFT-CATEGORY DRINKING WATER IN KUPANG CITY IN 2022. In: Proceeding of The 1st Polkesraya International Conference. Poltekkes Kemenkes Palangka Raya, Palangka Raya, pp. 176-186. ISBN 2987-8659