Seachem Ammonia Alert - Continuously monitors ammonia

  • Stock: Only 1 left in stock - order soon
  • Dimensions: 1.5" x 2.5"
  • Model: 020110
Price: £9.99 £7.9920% off
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Ammonia AlertTM is an innovative color device for continuously detecting and monitoring toxic free ammonia. A sensor changes reversibly from yellow to green to blue, relative to the ammonia concentration. No test kits, chemicals, or procedures are needed. The device detects less than 0.05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress. It lasts over a year and replacement sensors are available. Marine or freshwater use.

In the absence of free ammonia the unit will assume a yellow or faint yellow-green color. It is normal for the dry sensor to have a greenish hue. It may take up to a few days for a dry sensor to equilibrate with the water. No sampling of water, chemicals, or test procedures are required. The presence of the free ammonia is detectable continuously with a response time of about 15 minutes. Response to decreasing ammonia is slower, requiring about 4 hours to go from TOXIC to SAFE on removal of ammonia.

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.

by Melanie W. on 25/8/2017

Although I test the ammonia with a test kit it's great to have something you can see clearly everyday, it's been reading no ammonia since I put it in which is the same as my test kit so working ok, quick delivery, same great service

by Martin McLachlan on 14/1/2013

Great product excellent for keeping a close eye on whats happening with your tank

by Catharina Amelie Ulse on 8/1/2010

This is a really good product that you can always rely on. It tells you exactly when water quality has changed.

Ask a question about this product
Despite my brand new API Master Test kit showing ammonia reading, this hasn't changed from it's original colour in a week. I've removed the plastic. Why is this ?


What zone is your Ammonia Alert sitting in? What reading is it showing?

I've checked it over a bottle of Ammonia, and it's working fine. pH is 6.4. Could that have anything to do with it ? Position is left hand side of the tank 2/3rds of the way up.


possibly but hard to tell

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