Is Twice Boiled Water Really Bad for You and Potentially a Carcinogen?

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In this video:

There’s a rather persistent idea that “reboiling” water (i.e. boiling water two or more times and allowing it to cool in-between) while making a cup of tea is potentially harmful to your health, with some going so far as stating that regularly doing this even drastically increases your chances of getting cancer. The general reasoning behind why this is purportedly the case goes something like this:

Want the text version?: http://www.todayifoundout.com/index.php/2016/06/not-supposed-use-twice-boiled-water-tea/

Sources:

http://www.hindawi.com/journals/isrn/2013/517601/
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwjBmcbBvpDMAhUK6mMKHfo6A_4QFggdMAA&url=http%3A%2F%2Fwww.awwa.org%2Fpublications%2Fjournal-awwa%2Ftable-of-contents%2Farticleid%2F36860480%2Fissueid%2F36860257.aspx%3Fgetfile%3D%255C%255Cpers75apppcr%255Cpersonify%255Cserverfiles%255Cdcdfiles%255C36860480%255Cwaternet.0077951.pdf&usg=AFQjCNH-Gumz0K8f2wh8vXMyuEq6qvIHjg
https://www.researchgate.net/publication/23433550_Removal_of_Dissolved_Oxygen_from_Water_A_Comparison_of_Four_Common_Techniques
http://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
http://link.springer.com/article/10.1007%2FBF00192042
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284091/
http://www.who.int/water_sanitation_health/publications/2011/9789241548151_ch10.pdf
http://chemwiki.ucdavis.edu/Core/Physical_Chemistry/Equilibria/Solubilty/Temperature_Effects_on_the_Solubility_of_Gases
http://serc.carleton.edu/microbelife/research_methods/environ_sampling/oxygen.html
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312355/
http://antoine.frostburg.edu/chem/senese/101/solutions/faq/temperature-gas-solubility.shtml
http://www.who.int/water_sanitation_health/dwq/chemicals/vinylchloride.pdf
http://www.academicjournals.org/article/article1380790850_Ma%20et%20al.pdf
https://www.researchgate.net/publication/13088219_Assessment_of_metal_content_and_toxicity_of_leachates_from_teapots
https://www.youtube.com/watch?v=FtK_vfp8po8
http://www.tandfonline.com/doi/abs/10.1080/19440049.2011.580010?journalCode=tfac20

Видео Is Twice Boiled Water Really Bad for You and Potentially a Carcinogen? канала Today I Found Out