Colombo NO3 Test

Nitrate is the final stage of the nitrogen cycle. The Colombo NO3 Test helps you measure nitrate (NO3) levels accurately, so you can manage long-term water quality with confidence.

Unlike ammonia and nitrite, nitrate is less immediately toxic – but high levels over time can affect fish condition and contribute to algae growth. Regular testing helps you stay ahead of gradual build-up.

Why nitrate matters

• End product of biological filtration
• Builds up as feeding increases
• Can encourage algae if left unchecked
• Indicates when water changes are needed

In established koi ponds, nitrate management is part of routine care, especially during warm months and heavier feeding periods.

What’s included

• Liquid drop test reagents
• Test tube
• Colour comparison chart
• Instructions

The colour comparison chart makes results easy to read, whether you’re testing as part of a monthly routine or investigating rising nutrient levels.

When to test NO3

• During peak feeding season
• If algae becomes persistent
• Before and after water changes
• As part of regular water checks

Good practice & safety

• Rinse the test tube with pond water before and after use.
• Store reagents in a cool, dark place.
• Keep all chemicals out of reach of children and pets.

Monitoring nitrate keeps your maintenance proactive rather than reactive.