API Ammo-Lock Freshwater & Saltwater Aquarium Ammonia Detoxifier

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16-oz bottle
  • 4-oz bottle
  • 8-oz bottle
  • 16-oz bottle
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If your aquarium tests positive for ammonia, help to neutralize it with the Ammonia Detoxifier from API. This clear, liquid treatment has been scientifically tested and works to protect fish cells from damage while helping to break ammonia down into a non-toxic form. The detoxified ammonia is then removed by your tank's biological filter, purifying your tank and supporting the overall health and safety of your aquarium. For high concentrations of ammonia, add 5 millimeters of the detoxifier for every gallon of tank water and continue every two days until ammonia is no longer detected.

Key Benefits
  • Proprietary formula works hard to protect your fish from the dangerous effects of ammonia.
  • Helps to detoxify ammonia, breaking it down, and removing chlorine and chloramines from your water.
  • Safe for use in both fresh and saltwater aquariums.
  • Supports the reduction of fish stress caused by water toxicity and promotes healthy gill function.
  • Treatment can be continued every two days until ammonia is no longer detected.

HAZARDS TO HUMANS: For animal treatment only. Keep out of reach of children. If swallowed, immediately give 2 glasses of water and induce vomiting. Call a physician. In case of contact with skin or eyes, immediately flush with water for at least 15 minutes. Call a physician.

Special Note

  • 4-oz bottle treats up to 230 gallons.
  • 8-oz bottle treats up to 470 gallons.
  • 16-oz bottle treats up to 940 gallons.

Test the ammonia levels in your freshwater or saltwater aquarium with API's Ammonia NH3/NH4 Test Strips and Test Kit.

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  • Item Number
  • Aquarium Type
    Freshwater, Saltwater

Use the API Dosing Cap on the Bottle. Add 5ml per 10 U.S. gallons of aquarium water. Continue to add AMMO-LOCK every 2 days until ammonia is not detected. If, after 7 days, ammonia is still present, perform a partial water change, service your biological filter and reduce feeding.

Tip: AMMO-LOCK does not remove ammonia; it converts it to a non toxic form. After using AMMO-LOCK, your aquarium water will still test positive for ammonia even though it is in a non toxic form which will be removed by the biological filter.


What does API AMMO LOCK do?

API AMMO LOCK’S main function is to detoxify ammonia, converting it into a non-toxic form. This non-toxic ammonia is then removed by the biological filter, or aquarium cycle, in the usual way. API AMMO LOCK is also a dechlorinator, and will remove chlorine and chloramines from tap water.

Will API AMMO LOCK work in both freshwater and saltwater aquariums?

Yes, API AMMO LOCK is effective in both freshwater and saltwater aquariums.

After API AMMO LOCK has detoxified the ammonia, will ammonia levels still show when testing?

Yes. API AMMO LOCK detoxifies ammonia, but it does not remove it, which means the ammonia will still show up when using test kits.

Can API AMMO LOCK be used with API medications?

Yes, API AMMO LOCK can be used safely with all API medications.

Does API AMMO LOCK reduce the smell of ammonia in aquarium water?

API AMMO LOCK helps reduce fish stress associated with ammonia presence, and promotes healthy gill function. It does not directly eliminate odors.

Fish Care Made Easier

API is a name you can trust when it comes to taking care of fish. Not only are they passionate about fishkeeping, but they're dedicated to improving the hobby and making it easier to maintain the ideal aquatic environment. From helping the novice set up a new tank to providing state-of-the-art filters for advanced systems, you can rely on API's dedication to quality.

Fish Care Made Easier
Maintain the Perfect Setup

Maintain the Perfect Setup

Fishkeeping is a much easier task with API, because they've taken all the guesswork out of setting up a tank and maintaining it. Their proven treatments include water conditioners and clarifiers, fish medications, pH adjusters, algaecides and quick-start solutions—all designed to keep your aquarium crystal clear and your fish happy and healthy.

Testing Is Key

Once you've started a new aquarium, the only way to keep it in perfect balance is with routine water testing. API gives you all the tools you need to create a nurturing environment for both fish and live plants. Their comprehensive Master Test Kits are tailored to freshwater, saltwater or reef environments, and individual tests for things like pH, ammonia or nitrites leave nothing up to chance.

Testing Is Key
Clearing the Water

Clearing the Water

API offers reliable three-step filtration for tanks of all sizes with their FILSTAR XP Canister filters and wide variety of filter media. These powerful filters constantly circulate the water, trapping organic waste and odors, removing harmful ammonia and contaminants, and helping good bacteria to thrive in the tank.

Superior Nutrition

Feeding your aquarium inhabitants, whether they're tropical fish, turtles or newts, is something that can be tricky without the right food. API developed a special diet for every type of fish—one that's highly palatable, which leads to less waste in the tank. And that means less ammonia to cloud the water. For your turtle friends, premium floating pellets and stick treats provide multiple vitamins for a stronger, healthier shell.

Superior Nutrition
About API

About API

Through extensive and continuous research and development, API created quality products for all levels of fishkeeping. As people who are passionate about fish care, they understand the rewards of keeping up a successful aquarium or aquarium. With easy-to-read guides and premium treatments, foods, filters and testing equipment, API helps aquarists establish and maintain an environment where fish can flourish.

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5 Reviews 5 Reviews 2.6 out of 5 Stars

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80% of reviewersrecommend this product

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  • 4 out of 5 stars

    Works like it's supposed to.

    By on

    I use this every time I do water changes for my 20 gallon and 55 gallon tanks. It works instantly and my fish and snails are able to adapt quickly. I do not have the best results when using API's Quick Start solution on its own - and usually I'll always have to add Ammo-Lock along with it. However, the Ammo-Lock Detoxifier works great on it's own and personally I do not recommend adding another solution unless it's API Stress Coat (which helps repair a fish's slime coat). I have not encountered the cloudy water problem that others have mentioned, it usually disperses quickly in the tank and clears out.

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  • 1 out of 5 stars

    Cloudy water

    By on

    Not sure if it detoxified the ammonia but the water is so cloudy now and I can’t get it to clear. I have to empty all the water and refill the tank. Ugh

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  • 1 out of 5 stars

    no don't recommend

    By on

    this stuff just made the water foggy thats all i could tell haveing hard time getting water to clean up again

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  • 3 out of 5 stars

    Cap was not tight

    By on

    Cap was loose and no seal under it so it leaked wasn't happy !!!!!!!!!!!!

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  • 4 out of 5 stars

    Great product.

    By on

    Did exactly what I needed it to. Will most definitely continue to use this, and quite a few other API products to maintain the high quality and standards I am used to.

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