Seachem Ammonia Alert
$7.79
Price: $7.79
(as of Oct 30, 2025 20:53:52 UTC – Details)
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. 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.
Is Discontinued By Manufacturer : No
Manufacturer recommended age : 1 month and up
Item model number : 10
Date First Available : June 15, 2004
Manufacturer : Seachem Laboratories, Inc.
ASIN : B000255R5G
Best Sellers Rank: #8,295 in Pet Supplies (See Top 100 in Pet Supplies) #9 in Aquarium Test Kits
Customer Reviews: 4.2 4.2 out of 5 stars 3,818 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Sachem sensor Technology
No Strips, no tests, just constant readings
For marine and freshwater use
Customers say
Customers find the Ammonia Alert easy to use and appreciate its value, noting it’s worth the price and serves as a nice monitoring system. Moreover, the product helps keep fish alive and maintains tank health. However, the functionality and accuracy receive mixed reviews – while some say it works well, others report it doesn’t work at all, and while some find it reasonably accurate, others note it’s not as precise as liquid tests. Additionally, the color change aspect is problematic, with multiple customers reporting that the color doesn’t change or is difficult to identify.
Julia Marie –
Excellent But Misunderstood Product
I was so worried about purchasing this ammonia reader due to the amount of bad reviews. However, after doing tons of research and deciding to purchase it after all, I realized that a lot of the negative reviews were because people werenât quite understand just exactly how the Ammonia Alert operates.It measures the amount of unionized (dangerous) levels of ammonia in the water, whereas test kits measure both the ionized (safe) and unionized (unsafe) ammonia present in the water. Therefor, the only reading youâre getting on the Ammonia Alert is that of the toxic ammonia present in your tank.This product definitely works. A few days ago, the reading on it was at the âAlertâ mark, which it turned a pastel green. Then, when I checked it today, it was a pastel yellow and definitely matched the âSafeâ zone on the wheel. Even though the color readings can be extremely subtle, theyâre pretty easy to pick out when it changes. I also compared its reading with a quick test from the API ammonia test kit, to which it came back with 0 ammonia in my aquarium.Another thing I must add is that you MUST be extremely careful when you open up the product. When you remove the plastic covering for the sensor in the middle of the color wheel, do not touch the sensor with your fingers. The oils from your fingers could affect or ruin your sensor.Overall, Iâm extremely pleased with this simple and cheap product. It will assure me that my fish are living well and I can take necessary action when it goes into the âAlertâ zone. I definitely recommend the Ammonia Alert if youâd like to monitor your aquariumâs ammonia levels while avoiding frequent water testing.
kennedy –
marine biology phd, it works
i was hesitant to buy this because of some bad reviews and didn’t want to “take the easy way out” of testing my saltwater tank’s ammonia when it could potentially be inaccurate. however, after biting the bullet and about a week of having it in my tank, i can say it definitely works and is accurate. JUST MAKE SURE YOU DO NOT TOUCH THE SENSOR IN THE MIDDLE AFTER PEELING THE PROTECTIVE PLASTIC. also, this measures the amount of TOXIC ammonia only, so the colors won’t match perfectly with a water test kit, which tests for the presence of all ammonia (normal and toxic). this is a must have in all tanks, especially the smaller ones where water conditions are harder to maintain. i am a marine biology phd and lifelong tank owner, and i would 10/10 recommend this to anyone (but especially the newbies!). i’m not sure of the shelf life, but i will probably switch out every 6-12 months to be safe. ðð¼ð ðª¸
Carleton A. Tucker –
Get It – It’s Worth The Investment
I’ve read all kinds of pro and con “opinions” on this product. It doesn’t work – it doesn’t match the API Ammonia Test result – and so forth. Well, in my experience it does work. And it’s already alerted me to ammonia spikes in two of my aquariums – well before they became a problem. It detects free ammonia which is the most harmful form (API detects free and bound ammonia and that’s why they may not agree). It lasts for a year. It reverts back to negative when the problem has been corrected. It’s less expensive, much easier to use and just as reliable as other methods. I have it in all four of my aquariums. I check it daily and I no longer do ammonia tests. Do yourself a favor and get this. Oh – and read the instructions or try watching one of the available videos on how to properly use it.
salvador cota –
This thing does not work
It’s extremely slow at detect ammonia presence, by the time it reads at 0.02ppm ammonia level is actually over 0.5ppm, and the only reason I discovered this is because I was skeptical, so I tested my water to find out that the ammonia level was at over 2ppm, and I immediately put in my bacteria to start the cycle. It took this thing till the following day to read 0.05ppm, so who knows how long the ammonia was present in my tank before this thing detected it. It read 0.02ppm for like 4 days before I decide to test the water my self, then an extra day after that to read 0.05ppm. Thanks to this unreliable thing my tank cycle took longer than if I had just let my tank cycle naturally. I tested the ammonia levels on my tank regularly, because I no longer trusted this thing. The ammonia in my tank was decreasing, but this thing continued to read 0.05ppm. When my ammonia levels went to 0.00ppm this thing was still reading 0.05ppm. It took it another 2 days from when I got a zero reading with the other tests kit for this thing’s reading to fall to 0.02ppm. then I lost count to how many days it stayed at 0.02ppm before I just took it out of my tank and tossed it in the garbage, it must’ve been like 4 days. And I continued to test my water, because this thing kept making me thing the ammonia probably crept back up, sense it wouldn’t go down to zero. I knew it was slow, but I thought it should eventually catch on. Seeing it not go to zero kept making me think there was probably ammonia present, and I would test, but nothing. Eventually I got fed up with it after like 4 days or so and tossed it. I don’t think this thing was ever going to read zero, and by the time it directed no ammonia present, my tank would already be building ammonia, and who knows how long it would take this thing to detect it. If I would really on this thing for my ammonia readings to determine when I should do my water changes I would probably loose live stock by the time it detects toxic ammonia levels.Do not rely on this thing for water changes, and when cycling a tank, it will deceive you. Mater fact stay away from it all together, you will regret buying it if you do.
Jeroen van Eerden –
Really liked this product for a ânot super experienced yetâ aquascape wannabe. Feel I can check easily for the ammonia potential in the tank now and be confident to trust this little tool for keeping my tank safe and healthy.
Ayub shaik –
Never believed this until now!!I bought it and used in my tank, I have a 7 in 1 strip test kit from flipkart, it has all test except for ammonia. Extra images added. I wanted to monitor ammonia whenever I want without checking when I have doubt or only when the fishes sart to die or the water gives foul smell. Now I can keep a check on ammonia 24/7.
Valentina –
No encontré tiras que midan amoniaco. Este dispositivo sirve perfecto, en cuanto hay picos de amoniaco lo puedes observar.
Thomas –
Après avoir eu des pics de nitrites (NO2) surprise été 2022 lors des fortes chaleurs,ayant entraîné une mort éclairé dâun magnifique baryancistrus chrysolomus que jâadorais (en deux heuresâ¦) ð. Suite à ce désastre, je cherchais un moyen de prévenir ce genre de soucis pour mes bacs les plus sensibles, sans avoir à passer par de continuels tests dâeau en goutte qui sont longs et dont les réactifs ne détectent PAS les NH3- (les ammoniacs les plus toxiques). Celui là les teste et permet donc dâavoir lâesprit tranquille lorsque lâon sait que les aquariums sont des écosystèmes fragilesâ¦.Je ne peux que le recommander, il est fiable et économique (dure UN AN). La réputation de fiabilité de Seachem nâest plus à démontrer ð¥°
gildo p. –
Ottimo e comodo, lo uso in una vasca per quarantena in acqua marina. Nella descrizione scrivono per acqua dolce, ma sulla confezione e provandolo va benissimo anche in quella salata