Rainwater is one of the most potential sources for water supply which can be used for everyday
purposes, including in hospitals. Rainwater relatively has good quality, however, in the harvesting process, i.e. by collecting the water pouring from the roof, pollutants may be brought and
affecting the quality of the rainwater. Filtration by using multimedia filter and ultraviolet disinfection (FM2FV) prior to the use of rainwater is one effort that can be applied to tackle that problem.
The study was held in Bethesda Hospital of Yogyakarta, and was aimed to know the influence of
the use of the filtration series in decreasing turbidity and coliform by employing a pre-test posttest with control group designed experiment. The rainwater sample was collected by using integrated sampling method from five collection points, and the subsequent examination of turbidity
and coliform were conducted in the Health Laboratory Office of Yogyakarta. Between each replications, in order to clean the filtration mediums, the series were washed before be used again.
The results showed that after the data were tested by using multivariate anova (manova), it was
found that the aggregated p value was <0.05, meaning that the filration process was significant
in declining both the turbidity level and coliform number between the treatment and control
groups. In the treatment group the turbidity and coliform decreased as much as 68,17 % and
95,11 %, respectively.