Escherichia coli is one of mandatory biological parameters of environmental health standard for
water media in terms of sanitation and hygiene purposes.The maximum level permitted is 0
CFU/100 ml. Based on laboratory examination, the clean water used by angkringan food stallers for food utensils at last rinse, was positively containing E. coli. Chlorine compounds can kill
micro-organisms in water, because the oxygen liberated from the hypochlorous compounds oxidizes some important parts of bacterial and make them damaged. A simple chlorination gives
chlorine dose administered only in about 0,2-0,5 ppm. The application of chlorine compound into clean water at the rinsing sink of those angklingan merchants require a chlorine diffuser. In
this study, the tool was invented in mini form with 20 holes of 1 mm diameter, and made from
used felt-tip marker. This study was aimed to descriptively determine the ability and effectiveness of that mini chlorine diffuser in producing residual chlorine after being used for washing
food utensils and cutleries. The water as the study objects were that of the last rinsing sink of
angkringan food stallers at Pajangan Hamlet of Sumberagung Village in Sleman Regency. The
study was conducted in six days and examining five samples per day. The residual chlorine
measurements were performed by randomly sampling one out of the five rinsing and used the
appropriate test kit. Based on the examination results, the average residual chlorine obtained
were: 0,22 mg/l, 0,24 mg/l, 0,24 mg/l, 0,24 mg/l, and 0,24 mg/l. Therefore, it can be concluded
that the mini diffuser is able to produce residual chlorine at 0,2-0,5 ppm.