The Water-to-Go bottle

We’ve teamed up with Water-to-Go to offer two lucky readers the chance to win a personal water filtration system.

The Water-to-Go drinking bottle contains a patented filter that removes 99.9 per cent of contaminants.

Ideal for outdoor enthusiasts, the Water-to-Go bottle means you can replenish your water supply without worrying about bugs and other nasties that could spoil your trip.

The Water-to-Go can also be used for sports and for general purposes – no need to buy expensive bottled water. The filter will remove chlorine, protozoa, bacteria and viruses, as well as heavy metals.

The 75cl bottle can be refilled more than 260 times before the filter needs replacing – or for three months.

grough has tested the Water-to-Go system. You can read our verdict in our separate test report.

For a chance to win your own Water-to-Go bottle, worth £25, just answer correctly the following question.

What proportion of contaminants does the Water-to-Go filtration system remove?

Sorry, this competition is now closed

Winners will be chosen at random from correct entries. Closing date is 8 July 2013. One entry only per individual; duplicate entries will be disregarded. No cash alternative to the prize will be offered. Winners will be notified by email and the draw organisers’ decision will be final.

You can find more details about the Water-to-Go filtration system on its website.

The company also has a Facebook page and will donate £1 to Child Aid Gambia for every Like it receives on its page.

You can also follow Water-to-Go on Twitter.