CO2 Checker and Liquid

CO2 Checker and Liquid

The CO2 Checker and Liquid is an aquarium CO2 monitor set that lets you keep an eye on the CO2 concentration in your tank at a glance. It suits planted-tank keepers who want a simple visual check that conditions stay right for their aquatic life.

Key Benefits

• Gives a visual indication of your tank's CO2 level, with no complicated equipment needed
• Uses a colour-changing reagent that reacts to the amount of CO2 dissolved in the water
• Made from good-quality glass for lasting durability
• Looks neat in the aquarium, so it works as a practical tool without spoiling the display
• Comes with a suction cup for quick, easy placement
• Helps you maintain a healthy, vibrant environment for fish and an underwater planted ecosystem

How to Use

The monitor works through the reagent in the glass ball. As the amount of CO2 dissolved in your aquarium water changes, the colour of the reagent changes with it, so you can read your CO2 level by eye. Fix the monitor in place with the suction cup, positioning it approximately 5 cm (2") below the water level for best results.

Dosage

• Reagent: five drops are all the monitor needs to work effectively
• Replace the reagent every 1 to 2 weeks to keep readings accurate
• Replacement reagent is sold separately

Suitable For

• Aquariums where CO2 concentration needs to be monitored
• Planted aquarium setups that rely on a healthy underwater planted ecosystem
• Hobbyists who want an easy, low-fuss way to check CO2 levels as part of their regular maintenance routine

What's Included

• 1 x CO2 glass checker
• 1 x suction cup
• 1 x CO2 liquid

Frequently Asked Questions

How does the CO2 checker show my CO2 level?
The reagent inside the glass ball changes colour according to the amount of CO2 dissolved in the water, giving you a visual indication of your tank's CO2 level.

Where should I place it in the tank?
Attach it with the supplied suction cup, approximately 5 cm (2") below the water level, for best results.

How much liquid do I put in?
Five drops of reagent are all it needs to work effectively.

How often should I change the reagent?
Replace it every 1 to 2 weeks to keep readings accurate. Replacement reagent is sold separately.

What comes in the set?
One CO2 glass checker, one suction cup and one bottle of CO2 liquid.

Is it suitable for a planted aquarium?
Yes. It is designed to help you monitor CO2 so conditions stay right for your aquatic life and your underwater planted ecosystem.

When can I expect delivery?

• Gauteng (Jhb/Pta) - 1-3 working days
• Nationwide (Cpt/Dbn+) - 2-5 working days
• Outlying Areas - 3-7 working days

All orders are sent via Economy Road, typically through Fastway or Internet Express Couriers*. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.

If you prefer a faster 🚀 shipping option, we also offer The Courier Guy during checkout in the dropdown selection. Please note that this option is not free, and you must choose it to use it. Please pay careful attention to the cutoff times and delivery timeframe for these options during checkout.

Enjoy the convenience of collection points and lockers! 📦

No more waiting at home or at work for your delivery. Simply choose a collection locker or pickup point and collect your order when it suits you.

Delivery times to lockers and pickup locations typically range from 2–7 working days, depending on your location.*

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Collection timeframes:

• Bob Box: Collect within 2 days of receiving your collection notification.
• PUDO Lockers: Collect within 36 hours of receiving your collection PIN or SMS notification.

If a PUDO parcel is not collected within 36 hours, it will automatically be transferred to the nearest PUDO Kiosk or Depot at no additional cost. The parcel will then be held there for approximately 2 days before being returned.

Please ensure you collect your parcel within the applicable collection period. Uncollected parcels will be returned to the sender, and additional shipping charges may apply should the order need to be resent.