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Liquid Tetra NH3/NH4+ ammonia test kit for aquariums and ponds. Measures total ammonia from 0 to 5 mg/l with three reagents and a colour chart.
Liquid Tetra NH3/NH4+ ammonia test kit for aquariums and ponds. Measures total ammonia from 0 to 5 mg/l with three reagents and a colour chart.
The Tetra Test NH3/NH4+ 17ml is a liquid total ammonia test kit for aquariums and ponds. It is designed to measure the combined ammonia/ammonium value, shown as NH3/NH4+, so you can spot water-quality problems before they become a health risk for fish.
This is a practical test for new aquarium cycling, established tank maintenance, heavily stocked systems, quarantine tanks, pond checks and any situation where fish behaviour or water clarity suggests that the biological filter may be under pressure. The official Tetra instruction leaflet states that the test measures total ammonia in fresh and marine water, including aquariums and ponds, across a 0-5 mg/l range.
Ammonia is one of the first parameters to check when an aquarium is new, overfed, recently cleaned, stocked more heavily than usual or showing signs of stress. The water can look clear while the chemistry is still wrong, so a dependable ammonia test kit belongs in the regular maintenance cupboard rather than being kept only for emergencies.
Fish waste, uneaten food, plant debris and other organic material can all contribute to ammonia. In a mature aquarium, beneficial bacteria convert ammonia into nitrite and then nitrate. When that biological process is not fully established, or when the filter is temporarily overloaded, total ammonia can rise quickly.
The Tetra NH3/NH4+ test gives you a direct check on that early warning parameter. Tetra's own guidance is clear: the total ammonia value should be as low as possible, with 0 mg/l described as ideal and readings above 0.25 mg/l harmful to fish. That makes this kit especially useful during cycling, after filter disturbance, after a missed maintenance routine, or whenever you need to confirm whether a tank is safe before adding livestock.
Use the product exactly as described in the Tetra instruction leaflet. The official method uses a 5 ml water sample, three liquid reagents, a colour-development period and a colour chart. The leaflet specifies reagent 1, reagent 2 and reagent 3, then a 20 minute wait for the colour to develop before matching the vial to the chart.
That colour comparison matters because this is a water decision tool, not a decorative accessory. Read the vial in good light, keep the glass clean and compare against the white area of the chart rather than guessing from the side of the tank. For the most useful trend, test at similar times and note the result alongside pH, nitrite and nitrate readings.
If total ammonia is above the safe range, act calmly and quickly. Tetra's instruction leaflet advises partial water changes of around 30% at a time until the total ammonia content is no more than 0.25 mg/l, as well as removing dirt such as plant remains and uneaten food. In freshwater aquariums, Tetra also advises using Tetra SafeStart to support the filter bacteria.
Do not keep adding livestock to a tank with elevated ammonia, and do not treat a high reading as a one-off unless the next tests prove the system has stabilised. Check feeding, stocking, filter flow and maintenance at the same time, because the test tells you the number but the aquarium routine explains why it happened.
| Brand | Tetra |
|---|---|
| Product | Tetra Test NH3/NH4+ 17ml |
| SKU | U966 |
| Supplier / product code | A1-735026 |
| EAN | 4004218735026 |
| Test type | Liquid aquarium and pond water test |
| Parameter | Total ammonia / ammonium, NH3/NH4+ |
| Measuring range | 0-5 mg/l total ammonia |
| Water types | Freshwater aquarium, marine aquarium and pond water |
| Method | 5 ml sample, three reagents, colour chart comparison |
| Colour development time | 20 minutes |
| Category | Accessories / Analysis and Control |
For a new tank, keep a written record of ammonia, nitrite and nitrate so you can see the cycle developing instead of relying on memory. For an established aquarium, test ammonia whenever something changes: new fish, heavy feeding, filter cleaning, plant die-off, illness, medication or a power interruption.
Ammonia testing works best as part of a wider water-care routine. Pair this kit with pH, nitrite and nitrate checks, keep the filter media healthy, avoid over-cleaning biological media in tap water and remove excess food before it decays. The goal is not just to get one good reading; it is to keep the aquarium stable enough that good readings become normal.
NH3/NH4+ refers to total ammonia/ammonium. The Tetra kit reports the combined total ammonia value so you can judge whether the water needs attention.
No. Tetra's own instruction leaflet states that the test is for fresh and marine water, including aquariums and ponds.
The official measuring range is 0-5 mg/l total ammonia.
The total ammonia value should be as low as possible. Tetra lists 0 mg/l as ideal and readings above 0.25 mg/l as harmful to fish.
Test during cycling, after filter work, after overfeeding, before adding fish, when livestock look stressed, and as part of a regular water-checking routine.
No. It is an ammonia test. For a fuller picture, use it alongside nitrite, nitrate, pH and hardness tests that match your aquarium or pond setup.
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