Skip to product information
1 of 1


Seachem Prime 500mL

Regular price
$14.99 USD
Regular price
$18.51 USD
Sale price
$14.99 USD

What is Seachem Prime Bonus Bottle?

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 readily removed by the tank's biofilter. 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. However, none of those 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 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 that renders ammonia, nitrite, and nitrate non-toxic. It is essential 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! So 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 insufficient. 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 over-activate protein skimmers.

Benefits of Seachem Prime Bonus Bottle:

  • Most effective aquarium dechlorinator 
  • Removes Chlorine & Chloramine
  • Detoxifies Ammonia
  • Detoxifies Nitite & Nitrate
  • Complete and concentrated conditioner for both fresh and saltwater
  • 5X more concentrated than competing products

How Does Seachem Prime Bonus Bottle Work? 

Prime may be used during tank cycling to alleviate ammonia/nitrite toxicity. Prime detoxifies nitrite and nitrate, allowing the biofilter to remove them more efficiently. It will also detoxify any heavy metals in tap water at typical concentration levels. Prime is non-acidic and will not impact pH. In addition, Prime will not over-activate skimmers. Use at start-up and whenever adding or replacing water.


Use one capful (5 mL) for every 200 L (50 US gallons) of new water. For smaller volumes, please note each cap thread is approximately 1 mL. It may be added to the aquarium directly but yields better results first when added to new water. If adding Prime directly to the aquarium, base the dose on aquarium volume. Sulfur odor is typical. For exceptionally high chloramine concentrations, it is safe to use a double dose. Use five times the regular dose to detoxify nitrite in an emergency. If the temperature is less than 30 C (86 F) and chlorine or ammonia levels are low, use a half dose.