This USB bottle generates surface sanitiser from water and salt.

Initially I was sceptical about this device since it shares a common appearance to the "hydrogen water enrichers". But in reality this odd USB spray bottle does actually make sodium hypochlorite sanitiser from plain tap water and salt using a process called electrochlorination.

And it works really well. The water stinks of chlorine afterwards and an ill advised taste test gave a strong salt and chlorine taste. When it was poured into tea/coffee stained mugs it had a profound cleaning effect when left for a while.

Here's a link to the Wikipedia article about the technology:-
https://en.wikipedia.org/wiki/Electro...

If I sounded a bit perplexed at their current regulation circuitry, it's because it didn't make sense. It looks like it should be a simple current regulator for this application to give good control over the concentration of the chlorine versus time, but a further test with a meter shorting out the electrode plates showed a very high current instead of a fixed regulated level.

Other than the use of what is effectively a voltage regulator for controlling the current, the rest of the circuitry is exactly what you might expect.

The most important thing to take away from this video is that in the event of emergency you can create hospital grade water and surface sanitiser from table salt, water and improvised electrodes.

Now I'm wondering if the real purpose of the earlier water hydrogen enricher was a self sterilising water container that created low level sterilants.

I'd love to know what they're using as the electrodes. I'm leaning towards a very stable stainless steel alloy as used in some hydrogen/oxygen generators.

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