Abstract:
Food industry is one of the most crucial and rapidly growing economic sectors in Indonesia. One of the examples is the food jam industry. This industry was located in Tangerang, Indonesia. The majority of the food jam industry uses its own source of water, so this part is also important
to water producers in Indonesia. Water used in the food jam industry should meet the requirements
of at least drinking water quality, so the factories need to treat the water. Good quality water is
water that requires good physical, chemical, and bacteriology properties. Hard water is a term
known for water that contains a high concentration of minerals such as Calcium (Ca) and Magnesium (Mg). Moreover, water with very high degrees of hardness is harmful to health. In this study,
we want to evaluate and determine the pH, total hardness, and total dissolved solids (TDS) at three
different times namely morning, midday, and afternoon. The results obtained in the range of pH
analysis are 6.98 to 7.99 with all cover times. The total hardness in the boiler water and the TDS are
around 252.6 to 388.2 mg/L and 310 to 406 mg/L, respectively. These results indicated that it has
fulfilled the requirements for total hardness values under the Minister of Health Regulations
(Permenkes) No. 492/Menkes/Per/IV/2010.
