How often do you clean your water bottle? Most people are guilty of just filling it up, drinking out of it, and repeating the process. After all, it's only water isn't it? However, the reality is quite grim.

Langone Medical Center in New York, has recently revealed the dangers of not washing your water bottle regularly enough. There's a lot of bacteria festering in there.

Microbiologists swabbed 12 different bottles to examine the extent of the growing bacteria, and revealed that in some, 300,000 colony-forming units (CFU) per square centimetre were discovered.

M​oreover, the study conducted a test on the four most popular bottles types. In bottles with a slide top, where lips touch the rim, there was a whopping 900,000 CFU! When left unwashed, the bacteria in a water bottle is equivalent to barnacles on a boat.

So, we definitely need to be washing our bottles. But how often? Once a week, apparently.

Dr. Philip Tierno, clinical professor of pathology and microbiology at NYU Langone Medical Center said, "It's imperative to scrub the inside of the bottle, too. Merely rinsing is not going to do the trick."

S​o get washing! Plus an occasional cycle in a dishwasher – if you've got one – is also a great shout.

A​re you guilty of never washing your bottle?

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