CO₂ Permanent Test Refill

The indicator liquid in the CO₂ Long-Term Test should be renewed after every water change, and at least every 14 days.
Only then does the carbonate hardness inside the bubble cap match the one in the tank and the reading stays reliable. With two drops per filling, one bottle lasts for many changes.
This item is the matching replacement reagent for the Dupla CO₂ Long-Term Test, item no. 80400.

Product benefits

• Original refill reagent for the Dupla CO₂ Long-Term Test, item no. 80400
• 10 ml, two drops per filling, enough for many changes
• Alcohol-free bromothymol blue solution, not classified as hazardous
• keeps for at least 18 months after opening

Good to know:
Fill the bubble cap with approx. 1 ml of aquarium water and add two drops of reagent.
Do not let the dropper touch aquarium water and close the bottle immediately.
Store cool, dry and dark, protect from frost and direct sunlight.
Do not use the solution if it has turned cloudy or flaky.
Keep out of reach of children. Do not drink. For aquarium use only.