Perbedaan Penurunan Kesadahan dengan Penyaringan Tipe A dan Tipe B

Jalakan Village in Pandak District, Kabupaten Bantul has the characteristics of limestone hills. The source of clean water of the residents contained levels of hardness of 391 mg/l CaCO3. The study was aimed to decrease the water hardness by implementing two types of filtration, by con-ducting a quasi experiment with pre-test post-test design. As the study object was local water company (PAM-Des) distribution in one of the consumer's house. The distribution water was fil-tered using Type A filter (5 cm activated carbon, 14,5 cm cation resin) and Type B (5 cm activa-ted carbon, 9,5 cm zeolite, 5 cm cation resin). The flow of water debit into the filter housing is 500 ml/minute, with 82,44 seconds contact time, and filtration capacity as much as 720 l/day. The Type A filter can reduce hardness level 72,93 %, higher than that of Type B which was 67,58 %. Data analysis with independent sample t-test obtained p-value of 0,013, which means that the different decrease is significant