Is UV in Pools Only used by Fools?
Jonathan Longcroft
Collingwood School
Floor Location : I 218 H

IS UV IN POOLS ONLY USED BY FOOLS?rn The purpose of this project was to find out whether ultraviolet light is as effective at killing bacteria in water as chlorine. The experiment involved dividing up a sample of bacteria-filled water into three containers. A UV light was shone on the water in the first container; the water in the second container was treated with chlorine; and the water in the third container was left untreated. Using a sterilized inoculating loop, two samples of water from each container were added to Petri dishes filled with nutrient agar and the bacterial growth on each Petri dish was monitored over the next 72 hours. The experiment was then repeated for accuracy.rn The results somewhat supported my hypothesis as the UV light did reduce the amount of bacterial growth however some bacteria was still present. The chlorinated water samples had little or no bacterial growth. As UV light proved effective in killing some bacteria, it could be used to reduce the amount of chlorine used in pools, but should not be used unaccompanied by another sanitation method.rn In connection with my experiment, I also examined some of the harmful effects of chlorine and the byproducts of the chlorination process such as chloramines or trihalomethanes, which result when chlorine mixes with other substances in a pool, like sweat or the ammonia in urine. These problems include asthma, sore eyes, dental enamel erosion, pregnancy miscarriages and even cancer.rn I discovered that UV in pools is not used by fools, unless it is used alone. It should be used to kill bacteria in water prior to the chlorination stage. This would result in less chlorine being required as fewer bacteria would be present and hopefully, fewer adverse affects to health.rn