Colombo Ammonia Test

Ammonia should always be at zero in a healthy pond. The Colombo NH3 Test (Ammonia) allows you to detect ammonia accurately, helping you protect koi from one of the most harmful water quality issues.

Ammonia is produced from fish waste, uneaten food and decaying organic matter. In new ponds or after filter disruption, levels can rise quickly. Early testing lets you respond before fish are stressed.

Why ammonia matters

• First stage of the nitrogen cycle
• Highly toxic to koi, even at low levels
• Common during pond start-up
• Can rise after overfeeding or filter cleaning

Routine monitoring is essential, especially in spring when filters are re-establishing.

What’s included

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

The clear colour scale makes readings easy to interpret and compare over time.

When to test NH3

• During new pond cycling
• After adding new fish
• When increasing feeding
• If fish show signs of stress

Good practice & safety

• Rinse test equipment with pond water before and after use.
• Store reagents cool and out of direct sunlight.
• Keep all chemicals out of reach of children and pets.

Regular ammonia testing gives you confidence that your biological filter is doing its job.