Steve Spangler Science Geyser Tube: Mentos & Soda Chemical Reaction Experiment for Kids – STEM Science Kit

The Steve Spangler Science Geyser Tube lets kids launch a soda geyser up to 30 feet high by mixing Mentos candies with a 2-liter bottle of soda. This reusable STEM kit includes one sturdy loading tube and a pack of Mentos, using a double‑pull‑pin trigger to prevent accidental eruptions. Designed for school, camp, or backyard science fun, it’s a hands‑on way to explore chemical reactions.

How the Geyser Tube Works

Drop Mentos candies into the tube, attach it to a 2‑liter bottle of soda (diet works best), then pull the pin. The candies fall into the soda, causing a rapid release of carbon dioxide that propels the liquid upward. The improved double‑pull‑pin mechanism gives you better control, so you can step back before the geyser erupts.

What’s Included

• 1 Geyser Tube loading mechanism (reusable)
• 1 pack of Mentos candies (enough for several launches)
• Product instructions

You provide: a 2‑liter bottle of soda (not included) and adult supervision.

Can You Reuse the Geyser Tube?

Yes – the tube is designed for repeated use. Just reload with fresh Mentos and a new bottle of soda each time. The durable plastic construction holds up to multiple eruptions, making it ideal for classrooms, camps, and science fairs.

Key Specifications

Tips for a Successful Launch

1. Use diet soda – it creates a taller geyser due to higher carbonation and less sticky residue.
2. Load the tube with 2–4 Mentos for best results.
3. Pull the pin swiftly and move back immediately.
4. Perform outdoors to avoid cleaning up sticky soda indoors.
5. Wash the tube with water between uses to prevent clogging.

Common Questions About the Geyser Tube

Does it work with any soda?

Yes, but diet soda produces a higher geyser because it lacks sugar, which can reduce fizz. Carbonated sodas with intense carbonation work best.

How many Mentos do I need?

You can use as few as 2 Mentos to achieve a 30‑foot geyser. More candies may increase the height slightly, but the effect is dramatic even with small amounts.

Is the tube safe for kids?

The Geyser Tube is safe when used as directed with adult supervision. The double‑pull‑pin helps prevent accidental launches. Always point the bottle away from people and animals.

Can I use the Geyser Tube for a science fair project?

Absolutely. It’s a classic demonstration of nucleation and gas release. You can test variables like soda temperature, number of Mentos, or different soda brands to collect data.