Water test reagent sera Chlorine-Test (Cl) 15 ml — for measuring chlorine in water

Tetra Chlorine-Test (Cl) is a liquid reagent test for monitoring free chlorine levels in fresh and marine aquarium water. The 15 ml reagent provides a simple way to check whether water contains chlorine and to verify the effectiveness of dechlorination treatments before introducing fish or other aquatic animals.

Advantages

The test is compact and easy to use, requiring only a small sample of water and a few drops of reagent to obtain a quick result. It is suitable for routine checks and helps ensure safe water conditions by confirming the removal of chlorine after treatment with dechloraminating products.

Suitable for

• Testing chlorine in freshwater aquariums
• Testing chlorine in marine or brackish aquaria
• Verifying effectiveness of dechlorination agents before adding fish
• Regular water quality checks during tank maintenance

When it may not be suitable

This reagent test measures chlorine only and does not provide information about other important water parameters such as ammonia, nitrite, nitrate, or pH. For comprehensive water analysis you will need additional tests. The small 15 ml volume is intended for periodic checks and may be insufficient for very frequent or professional laboratory use.

Key specifications

• Measured parameter: Chlorine (Cl)
• Form: Liquid reagent
• Volume: 15 ml
• Package type: Hanging box
• Country of origin: Germany

How to use

Collect a sample of aquarium water and add the specified number of reagent drops according to the test instructions, then compare the resulting colour to the reference scale included with the test. If chlorine is detected, treat the water with an appropriate dechlorinating product and retest to confirm removal before introducing fish.

What to consider before purchase

• Test measures only chlorine; additional tests required for other parameters
• 15 ml reagent is sufficient for approximately 45 measurements
• Intended for routine, at-home aquarium checks rather than high-volume laboratory use

Usage recommendations

Use this Chlorine-Test to check water after fillings or tap water changes and retest after applying dechlorination products such as sera aquatan, sera KOI PROTECT, sera toxivec or sera pond toxivec to ensure chlorine has been neutralised before adding fish.