Ruri Prihatini Lubis, Muheri Indra Aja Nasution. Analysis of the Effect of Using a Natural Water Filter on the Efficiency of Household Expenditure and Customer Satisfaction at Perumda Tirtanadi in Hamparan Perak Sub-District . JU-TI [Internet]. 2026 Jun. 27 [cited 2026 Jul. 9];5(01):118-2. Available from: https://jurnal.seaninstitute.or.id/index.php/juti/article/view/1013