Abstract
Clean water is essential to our existence and problems might arise when it becomes contaminated with different pathogens, which might pose a threat to human health. Tap water is generally considered drinkable since it passes different forms of disinfection during processing. Some households have additional disinfection procedures, the most common one being the usage of charcoal filters, in order to further clean the tap water from both undesirable solvents and microorganisms. In the first independent study of this kind, we have tested tap water for bacteria from five different locations in Sarajevo, and we have tested the efficiency of charcoal filter in trapping of bacteria. According to regulations in Bosnia and Herzegovina, there should be 1 colony forming unit (CFU) per 50ul of water sample, which was satisfied in only one location from Sarajevo, while one had significantly higher levels (6.7, p val. 0.0148). Overall, the charcoal filter has decreased the number of bacteria in the water, with the exception of one sample.
Highlights
Water comprises 75% of the human body and makes about half of the volume of every cell [1]
Our results show that there is a large difference in the microbiological water quality from different locations in Sarajevo
The allowed limit the number of colony forming units (CFU) is 1 per 50ul of water sample
Summary
Water comprises 75% of the human body and makes about half of the volume of every cell [1]. Roles of water range from being a building material, nutrients carrier, reactant, lubricant, reaction medium and solvent [2]. Due to these and our regular daily need for water, it is crucial for drinking water to be clean of pathogens, yet lack of clean water is one of the biggest challenges humanity will have to face in the future [3]. Besides developing countries where the lack of tap water may be apparent, many other regions of the world are familiar with the tap water for more than a century [4] Even though it is mostly considered as a drinking water, it may not always be the case, which is why certain purification and sterilization methods can be implemented in order to make the water potable [5]. The presence of such organisms in water may be due to water systems that sometimes host bacteria or due to contamination of tap water sources [4]
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