Danish researchers: don’t reuse water bottles – The Post

Danish researchers: don’t reuse water bottles

Water bottles reused five days in a row showed a significant increase in bacteria concentrations

Don’t reuse them (photo: Стефан Симов)
November 1st, 2016 3:15 pm| by Christian W
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Reusing the disposable plastic water bottles purchased in kiosks or supermarkets is a bad idea, according to Danish researchers.

An Aarhus University study in which water bottles were reused five days in a row showed the bottles ended up having bacteria concentrations 16 times higher than the safety limit for water coming from the waterworks.

“The bottles are made of a material similar to a standard sports bottle, but they are not designed to be cleaned,” Christel Søgaard Kirkeby, a spokesperson at the Danish Consumer Council THINK Chemicals, told Berlingske newspaper.

“A biofilm will form on the inside of the bottle, and a layer of bacteria will develop. It won’t happen right away, but it will build itself up. A sports bottle is easier to disassemble and clean.”

A good rule of thumb is to:


– purchase water bottles that are made to be washed and cleaned in the washing machine

– use drinking bottles that have a removable lid, thus allowing for better cleaning possibilities and access

– wash the water bottle after every time it is used