Ammonia Alert

SKU: 198605
Manufacturer: Seachem
MPN: 10

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The color changing sensor of Seachem's Ammonia Alert lets you know when free ammonia levels are dangerously high in your aquarium. Four levels of ammonia detection; safe, alert, alarm, and toxic, keeps you aware of your aquarium's current ammonia content. Will accurately read ammonia levels even if an ammonia remover is in use.


Indicator MethodColor Change
Internal Id


Interpretation: As little as 0.02 mg/L of free ammonia will produce a greenish hue on the detector surface. This corresponds to a total ammonia (both ionized and free ammonia) of 0.25 mg/L in marine water at pH 8.3. In freshwater at pH 7.0, this corresponds to 3.6 mg/L total ammonia. Free ammonia is much more toxic than ionized ammonia. As free ammonia, the ALERT color corresponds to about 0.05 mg/L, ALARM to about 0.2 mg/L, and TOXIC to about 0.5 mg/L. The ALERT concentration is tolerated for several days, ALARM for a few days, and TOXIC is rapidly harmful. This product is not recommended for use at acid pH.

Care: No care is required beyond removing algae with a clean, soft material. Avoid touching the sensor with fingers, since skin oils can damage it. Do not use bleach, soap, detergents or hard objects to clean the sensor. Some dye medications may discolor the sensor. Sensitivity improves with age, provided the unit is not allowed to dry out, however, drying does not permanently impair the unit. For maximum sensitivity, the unit should be read under natural daylight or daylight simulating light. Red enhancing light minimizes green and blue hues, decreasing the apparent sensitivity of the unit. The response of the unit may be checked by holding it briefly over the mouth of an ammonia bottle: color should develop rapidly.

Ratings & Reviews

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Don't Leave Home Without One!


Having used Seachem ammonia Alert meters for years, I find them indispensable.

I've tried other meters but have found them to be just awful. Inaccurate readings galore and you have to replace the cartridges every 4-6 weeks.

They're also 2-3 times the cost of the meters by Seachem.

The Seachem meters don't replace proper testing of water parameters but then they're not meant to. They simply alert you to Ammonia spikes.

They won't give you a specific reading but rather let you know at a glance if there's a problem ranging from alert to toxic.

From that point you need to get out your test kits and confirm your ammonia level.

The meters perform exactly as intended - serious hobbyists have been relying on them for years as a tool to prevent potential disaster.

Seachem states each meter will last a year, but I replace mine every six months or so - to stay on the safe side.

At the minimal price for these meters I find them an exceptional value when used correctly for their intended purpose.

Seachem ammonia alert meters provide added peace of mind (and with keeping fish we need all of that we can get) - not to mention they warn you of potential disaster and loss of fish by ammonia poisoning.

At a mere cost of $6 and change apiece. It's money well spent.

great ammonia alert.


I don't check for ammonia all the time when I do a water test so this will let you know if something happens like a dead fish or something.

Ammonia Alert


I totally agree with Peter (the above posting). It alerts you to a problem and you deal with it before it gets out-of-hand. I, too, replace both the PH and the Ammonia Alerts very 6 months. They are cheap and very effective. I highly recommend them both.

Great product


I have one in all 6 tanks. If color changes just a touch I do a water test immediately. I can catch a small problem before it becomes out of control. I would not be without them.