Professor Anas Ghadouani and his team at the University of Western Australia in Perth have tested metal and plastic water bottles. The immediate cause was that more and more people refill purchased bottles with tap water for environmental reasons; it means that you do not need to buy a bottle again and again. But how harmful is this refilling plastic bottles for your health?
According to Ghadouani glass and metal bottles are safest, especially bottles made from stainless steel. They are followed by the plastic bottles that are specially made to be reused, such as for instance a Dopper. The professor says that in general it is wise not to do this longer than one year.
Refilling PET bottles is nothing short of the worst option, as there will always be plastic particles in the water. Especially when you place such a bottle in the sun, many microplastics are released.
Source: https://www.news.uwa.edu.au/archive/2018121211165/great-debate-plastic-versus-metal-water-bottles/
