1. Can you do this in person in London? Are there department stores that may carry it? My grandparents prefer this so that they can try and see the filter before

Afterword: Please see this post to learn why I am asking about these drastic types of water filters.

closed as off-topic by JonathanReez, Giorgio, David Richerby, blackbird, reirab Sep 27 '16 at 2:25

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  • "Questions on price-shopping for specific goods or services are off-topic as prices and availability change frequently in many locations. See: What is a shopping question?" – JonathanReez, Giorgio, David Richerby, blackbird, reirab
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  • 4
    I'm voting to reopen. People should read up on good vs bad shopping questions before claiming that as a close reason. Even as indicated in the only answer so far, it's not easy to know where to get one in a physical shop. Given that London is the kind of big city where you would expect to be able to get anything, there is surely a place. Hard to find specialized travel related items are one of the clear examples of good shopping questions. – hippietrail Sep 27 '16 at 3:59
  • Removed question 2 since the usual suspects will definitely apply. – Karlson Sep 28 '16 at 0:35
  • This kind of thing? nomadtravel.co.uk/c/258/Water-Purification – A E Oct 24 '16 at 20:11

I assume you have seen the upvoted advice on your previous question, which advises you that you might not need this device after all.

I'll assume you have weighed this over, and decided to get the device. Therefore, let's answer your question.

Due to the decent quality of the tap water in London, these devices are probably not all that popular there. Since it's such a huge city, it's probably available in certain shops but the additional requirement of "portable" would probably make it (especially RO) much harder to find.

My grandparents prefer this so that they can try and see the filter before

Unless your grandparents have special knowledge of water purification systems, they don't need to see them before they buy them. The main thing is getting a functional system. Amazon UK has many possible candidates for portable RO systems. That is indeed the easiest way. Check out the reviews before you buy. Amazon even has a nice return policy. Returns with Amazon are very easy, should there be anything unsatisfactory about the product. You could even get a total dissolved solids meter to test the water the product gave you. That way you'll know whether it works or not.

You can get a distiller there too. But I recommend RO. Distillation is wasteful of electricity.

  • Thank you and upvoted. However, none of the portable RO systems listed in your links are truly available from the original sellers (and not from possibly unreliable 3rd parties). Please see travel.stackexchange.com/q/79667/47623. – Tamara Milanovic Sep 27 '16 at 20:12

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