I had a volcano making task to do at school, so how to explode it? GEYSER TUBE! Rap up the coke bottle in a picture of a volcano, bish bash bosh and your volcano is done! Then I exploded it and it went off the camera it was so high. Everyone was impressed and I got some house points for it as well. Great buy, even better buy when you have to make a volcano explode!
Haris, London - Dec '08

Wow! A great buy, at first I thought it would just be a little spurt of coke.... Boy was I wrong! I bought about 5 cokes and 5 Mentos packets. I LOVE IT, A MUST BUY!!! ps. I said to my mate "look down the tube it might be blocked". He looked down I pulled the pin HA! Lets just say he wasn't thirsty afterwards.
James Randall, Stockton-on-tees - Jul '08

It is amazing. Everything is about a reaction called nucleation. The mints have hundreds of tiny pits on them. When dropped in the coke the pits (also called nucleation sides) let all the carbondioxide change into bubbles the pressure goes up and the coke and carbon dioxide shoot up. Oh and it does not have to be coke try some other soft drinks but coke is the best!
Sven Leidenbach, Harwell - Apr '08

My friend saw this & said I must buy it! I have & what a great bit of 'party kit' it is too! Looking 4wd to sharing this with the kids in my class. Buy one today.... Do it!
G Lowe, West Sussex - Sep '07

A device that drops mints into a fizzy drinks bottle!! Why would you want one? (cos it's funny is the answer... now get ordering!!).
Mike Scott, Great Yarmouth - Jun '07

This isn't really a review, it's just to say that those proper Mentos are hard to find but Extra mints work just as well.
Bill, Dundee - May '07

This devise is SO simple yet so effective. Has caused a lot of mayhem, best place to do it is high up at an angle so it goes length, and height is very fun and very chaotic :P.
Daniel Vickery, Liverpool - May '07

Well! This is good! I just used to put a whole packet of Mentos in the top but this is much better but I think its not as fun as dropping in a packet into a bottle of diet cola. SOOOOO ORIGINAL AND FUN.
Matty, Hull - Sep '09

I will tell you what not to do with this: take it into your local KFC, buy a family bucket, get a free coke put the geyser in. Load it, pull the cord, aim it at the cashier. He gets covered, he also gets the manager and you get a lifetime ban and the dude stole my geyser so I just got another and got banned from a different 1 :).
Luke Taylor, Stratford - Apr '08

I bought the geyser tube and tried it with tesco value cola and mint imperials. Works really well and saves alot of money! It great fun and you still get an amazing height!
Andrew, Belfast - Oct '07