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Concentrated Aquarium Conditioner

PRIME by Seachem

Concentrated Aquarium Conditioner by Seachem Prime®. The complete and concentrated conditioner for freshwater and saltwater aquariums. Prime® takes out chlorine, chloramine and it detoxifies ammonia. This product also changes ammonia into a safe, non-toxic form that is removed by the tank’s bio filter.


Prime® may be used during tank cycling to relieve toxicity of ammonia/nitrite. Prime® detoxifies nitrite and nitrate, allowing the bio filter to efficiently remove them. Additionally, Prime detoxifies heavy metals found in your tap water at typical concentration levels. Prime® is non-acidic and doesn't impact pH levels or over activate skimmers. Use when starting up a tank and whenever adding or replacing your aquarium water.


When transporting or quarantining fish, it is recommended to use Seachem StressGuard™. When you are adding new fish to a tank, use Stability®. Both of these products are ideal to use with Prime®.


Most companies manufacture a product that removes the chlorine. None of those products can compare to the quality, concentration, or effectiveness to Seachem’s product Prime®. Prime® is the second most concentrated dechlorinator on the market. One 100 mL bottle will treat 1000 US gallons of tap water. Prime® will remove both chlorine and chloramines from municipal water supplies.


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


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.

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Concentrated Aquarium Conditioner

Prime By Seachem



  • 1 cap­ful to every 200 L (50 US gal­lons) of new water
  • Each cap thread is approx­i­mate­ly 1 mL
  • Each cap­ful is 5mL
  • Read instruc­tions care­ful­ly
  • Rec­om­mend­ed to add to new water first not direct­ly into the aquar­i­um
  • Base dose on size of aquar­i­um if adding direct­ly
  • Nor­mal sul­phur odor
  • If real­ly high chlo­ramine con­cen­tra­tions present, a dou­ble dose may be used safe­ly
  • In an emer­gency, you can detox­i­fy nitrite by dos­ing up to 5 times nor­mal dose
  • It is rec­om­mend­ed to use a half dose where tem­per­a­tures read high­er than 30°C (86°F) and where chlo­rine or ammo­nia lev­els are low


Sizes Available:

50 mL, 100 mL, 250 mL, 500 mL

1 L, 2 L, 4L



Seachem – Aquavitro

For over three decades, Seachem has been a company surrounded by science. They have experience in the hobby of aquatics and have an educated staff of chemists and biologists. Seachem is owned and operated by hobbyists. The employees maintain aquariums at home and in the office. Seachem offers innovative solutions that work better than competing products and save you money through their efficiency and concentration. Their products offer a full spectrum of aquarium requirements in freshwater, saltwater, reefs and ponds. Products range from aquatic conditioners, buffers, filtration media, medications and test kits. Their JurassiPet line includes foods, nutrition supplements and products for enclosure maintenance and parasite control. Aquavitro is Seachem's premium line focusing on the essential components of reef keeping and live aquarium plant keeping.
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