sera Chlorine Test

The sera Chlorine Test (Cl) is a quick reagent test for detecting chlorine in your aquarium or tap water. Chlorine and chloramine are added to municipal water and are highly toxic to fish, invertebrates, and the beneficial bacteria in your filter. This test lets you confirm your water conditioner has fully neutralized chlorine before you add new water, protecting your livestock during water changes and top-offs. Pair it with a quality water conditioner and the rest of our water test kits.

Why test for chlorine

Even small amounts of chlorine damage fish gills, stress invertebrates, and can crash your biological filter. Tap water chlorine levels vary by municipality and season, and a standard dose of conditioner is not always enough. Testing confirms your water is safe before it ever reaches your tank.

How to use

• Rinse the test vial with the water to be tested
• Add the sera reagent exactly as directed in the instructions
• Compare the resulting color against the sera color chart to read the chlorine level
• If chlorine is present, add more water conditioner and retest before using the water

Follow the included sera instructions for exact drop counts. Suitable for freshwater and marine aquariums.

Specifications

Frequently Asked Questions

Why test for chlorine? Chlorine and chloramine in tap water are toxic to aquarium life. Testing confirms your dechlorinator worked before the water reaches your fish.

Does it work in both fresh and saltwater? Yes, it is suitable for freshwater and marine aquariums.

How do I remove chlorine? Use a water conditioner or dechlorinator, then retest to confirm the chlorine is neutralized.

When should I test? After water changes, whenever you use new tap water, or if fish show distress following a change.