Seachem Prime

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  •  Complete and concentrated conditioner for both fresh and saltwater
  •  Removes chlorine, chloramine
  •  Detoxifies ammonia, nitrite, and nitrate
  •  5X more concentrated than competing products


Prime® is the complete and concentrated conditioner for  both fresh and saltwater. Prime® removes chlorine, chloramine and  detoxifies ammonia. Prime® converts ammonia into a safe, non-toxic form  that is readily removed by the tank’s biofilter. Prime® may be used  during tank cycling to alleviate ammonia/nitrite toxicity. Prime®  detoxifies nitrite and nitrate, allowing the biofilter to more  efficiently remove them. It will also detoxify any heavy metals found in  the tap water at typical concentration levels. Prime® is non-acidic and  will not impact pH. Prime® will not overactivate skimmers. Use at  start-up and whenever adding or replacing water.


When transporting or quarantining fish, use Seachem StressGuard™. When adding new fish, use Stability®. Both are ideal for use with Prime®.


Nearly all companies manufacture a product that removes  chlorine. None of those, however, can compare in quality, concentration,  or effectiveness to Seachem’s flagship product: Prime®. Prime® is the  second most concentrated dechlorinator on the market after our own  aquavitro alpha™. A single 100 mL bottle will treat 1000 US gallons of  tap water. Prime® will remove both chlorine and chloramines from  municipal water supplies. 

Prime® also contains a binder which renders ammonia,  nitrite, and nitrate non-toxic. It is very important to understand how  those two functions work together. All dechlorinators operate through a  chemical process known as reduction. In this process, toxic dissolved  chlorine gas (Cl2) is converted into non-toxic chloride ions  (Cl-). The reduction process also breaks the bonds between chlorine and  nitrogen atoms in the chloramine molecule (NH2Cl), freeing the chlorine atoms and replacing them with hydrogen (H) to create ammonia (NH3).

Typically, dechlorinators stop there, leaving an aquarium  full of toxic ammonia! Seachem takes the necessary next step by  including an ammonia binder to detoxify the ammonia produced in the  reduction process.

Be very careful when purchasing water conditioners. If your  municipality includes chloramines in the water supplies, a standard  sodium thiosulfate dechlorinator is not enough. Prime® promotes the  natural production and restoration of the slime coat rather than relying  on artificial or non-native slime compounds. A further bonus for the  reef hobbyist—Prime® will not overactivate protein skimmers.




Use 1 capful (5 mL) for each 200 L (50 US gallons) of new  water. For smaller volumes, please note each cap thread is approximately  1 mL. May be added to aquarium directly, but better if added to new  water first. If adding directly to aquarium, base dose on aquarium  volume. Sulfur odor is normal. For exceptionally high chloramine  concentrations, a double dose may be used safely. To detoxify nitrite in  an emergency, up to 5 times normal dose may be used. If temperature is  > 30 °C (86 °F) and chlorine or ammonia levels are low, use a half  dose.

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