When you go abroad, you might've heard the advice to stick to bottled water since drinking tap water can sometimes cause illness.
Well, this is because the water quality and treatment standards can vary between countries. That said, tap water in countries like England, Finland and Switzerland is generally considered safe.
However, one video might just put you off water altogether - at least it has for most people.
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A TikTok channel dedicated to showing what objects look like under a microscope showed some shocking results about rain and tap water, presumably in the US.
When the tap water was put under the microscope, it seemed to show a concerning number of live micro-organisms including what appeared to be copepods.
Additionally, a worm-like organism was spotted, which makes you question what is really in what you're drinking.
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The rainwater also contained several micro-organisms, some of which were believed to be parasites.
The findings have understandably left some people now feeling 'terrified of water.'
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One user questioned: 'Are you trying to make me never drink water again?'
Whereas, others believe the rain water to be contaminated since it was collected from the ground rather than directly from rainfall.
'It defeats the purpose when you get the rain water from the ground,' someone argued.
'Maybe sample rain water as it falls and not off the ground?' offered a second.
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Meanwhile, one request to examine bottled water under a microscope gained over 50,000 likes. Whilst another TikTok user was praised for reassuring worried viewers, writing: 'all of these microorganisms tend to die when they meet stomach acid'.
Despite the horrific findings, the Centers for Disease Control and Prevention (CDC) emphasises that the US has 'one of the safest public water supplies in the world'.
The public health agency advises that if you are worried about contaminants in your home’s water system, 'contact your state drinking water certification officer to obtain a list of certified laboratories in your state.
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'Depending on how many contaminants you wish to test for, the cost of a water test can range from $15 to hundreds of dollars.'
As for rainwater, the CDC urges people to only use it for purposes outside of consumption and washing.
They continued: 'To lower your risk of getting sick, consider using rainwater only for uses such as watering plants that you don’t eat or washing items that are not used for cooking or eating.
'Avoid using rainwater for drinking, cooking, brushing your teeth, or rinsing or watering plants that you intend to eat. Instead, use municipal tap water if it is available, or purchase bottled water for these purposes.'