Review: Steve Spangler's Geyser Tube

Rated 4.5/5
Cola, Chemistry, Steve Spangler, CoolThings Australia
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Level Up Your Diet Coke & Mentos Explosions

Dropping Mentos into Diet Coke has to be one of the most satisfying STEM activities/experiments any parent can do with their kids; An entertaining Coke explosion that is educational!

But did you know, you can level up your explosions by using the Geyser Tube by Steve Spangler? A simple and cheap stem toy that not only makes the Diet Coke & Mentos experiment easier but also makes it better!

Last week, the team at CoolThings Australia sent one our way and asked us to test drive it and let them know what we honestly thought. We gladly took them up on the offer, and here is our review of the Steve Spangler Geyser Tube.

Geyser Tube Overview

The Geyser Tube is quite simple. It screws onto the top of a Coke bottle (Diet Coke is less messy) and makes the experiment easier and better. Here is how:

Easier to Deploy Mentos

The Geyser Tube has a trigger/release mechanism on the bottom, and it makes it easy to deploy your mentos into the Diet Coke. Without it, you would have to find a way to join all of your mentos and drop them in. If you dropped them in one at a time, it would not work because the first Mentos would set off a small reaction. The Geyser Tube makes this process simple.

Bigger Explosion, Higher Cola Stream

On the top of the Geyser Tube is a Flow Restrictor/nozzle. It reduces the size of the outlet, which increases the pressure, and the result is a higher stream of Coke. It works the same way as your nozzle does on your garden hose.

Read More: How The Geyser Tube by Steve Spangler Works

Parts of the Geyser Tube

Our Geyser Tube Video

Here is the video we took when we tested out the Steve Spangler Geyser Tube. We aren't experts in video creating yet, so please accept our apologies in advance. However, we think this video demonstrates the Steve Spangler Geyser Tube quite well and shows you the advantages in action.

Our Review/Opinion

Just before we give you our opinion, we need you to know something; Just because this item was given to us, we do not bias our opinion. We are very clear to all companies that send us products that our opinion can not be bought. If we review a poor performing, item, we will let you know regardless of how we got it.

What We Liked

Here are the features we liked about the Geyser Tube:

Easy to Deploy Mentos: This would be the best feature hands down. It makes this experiment easier to do over and over again.

Higher Geyser: The higher the Coke goes, the better. The nozzle certainly helps make the experiment better.

Reusable: You can use the Geyser over and over again. Nothing needs replacing.

What We Didn't Like

The Geyser Tube is so simple; there isn't much to dislike. Here are the only faults we could find:

No Seals: The plastic is quite hard, and there are no rubber seals included. You need to screw it onto the bottle quite tight to stop the Cola from exploding out from where they screw together.

Error on Package: This has nothing to do with the product, and doesn't affect anything... But, we thought it was quite funny that there are two Coke Explosions on the package, and neither of them is using the Geyser Tube (See pic below). Once again, nothing to do with the toy, just amusing packaging.

Geyser Tube Package Error


This is a pretty cheap toy, at around $10AUD. You can reuse it over and over again, and it makes the famous Mentos & Diet Coke Experiment easier and better. We give this toy a 4.5 out of 5.

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