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Seachem Laboratories Ammonia Alert


Item #: SC4111

In Stock

Ammonia Alert 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.

  • Seachem sensor technology
  • Continuously detects and monitors free ammonia
  • No test kits, chemicals, or procedures are needed; just constant readings
  • Lasts over a year
  • Marine and freshwater

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.

Manufacturer information

Seachem Laboratories, Inc. was established in 1980 by Dr. Leo G. Morin. Seachem moved into a state of the art 110,000 square foot facility in Madison, Georgia marking their 25th anniversary in the industry in 2005. This facility includes production and research laboratories, manufacturing, inventory, shipping, and office space.

5 Stars


Reviewed on
July 29, 2020

Yes, I would recommend this.

ammonia measures

Pros: small and clips to the wall with the suction cup

Cons: still have to dip my hand in the aquarium tank

this is a good product i like it because i don't have to dip my hand and test my water with drops and wait for results i have not use it yet but i am excited to use this in the following month

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Reviewed on
April 22, 2020

Yes, I would recommend this.

Probably received a dud

Pros: Gives quick visual indication of ammonia levels

Cons: Indicator peeled

When peeling off the protective film the color changing indicator also peeled off halfway. I tried flattening it back down but started peeling again when in the tank. I had one before for a QT and it was fine. It's better than just second guessing.

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Reviewed on
July 20, 2019

Yes, I would recommend this.

Great for quarantine and freshwater

Pros: Quick and easy

Cons: Unknowns

Great for quarantine tank where ammonia spikes are likely. I question potential leeching into the water too much to trust it in my reef tank though.

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Reviewed on
April 22, 2019

No, I would not recommend this.

Could not trust it

Pros: inexpensive

Cons: not reliable

Bought the Seachem ammonia alert based on the reviews, but in the end I just could not trust it. Color on center dot did not seem to match color wheel. I was hoping it would work, but end up buying an ammonia test kit to measure the levels in my tank.

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Reviewed on
April 09, 2019

Yes, I would recommend this.

Great little tool

Pros: Price, size

Perfect for cycling your tank.

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Reviewed on
April 06, 2019

Yes, I would recommend this.

Peace of mind.

Pros: Small size

Cons: None

I bought this to monitor ammonia levels in a breeding tank. I didn’t have a problem with ammonia, but it was nice having a constant checker!

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Reviewed on
April 04, 2019

Yes, I would recommend this.

Seachem Laboratories Ammonia Alert

Pros: Easy to read

Cons: 1 year life span

Quick and easy read. A must in a QT tank.

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Reviewed on
March 26, 2019

Yes, I would recommend this.

Must Have for QT

Pros: Easy to use and affordable

Great way to monitor Ammonia levels in QT and aquarium during cycling. easy to use and affordable

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Reviewed on
March 25, 2019

Yes, I would recommend this.

Good product

Good if you want to do a quick check on your amonnia levels.

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Reviewed on
March 21, 2019

Yes, I would recommend this.

Ammonia test

Pros: Always working easy to read

Cons: None yet

Easy way to keep an eye on that bsd and deadly ammonia unit is very accurate and you don’t even notice it that much

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