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Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml

4.8 4.8 out of 5 stars 35,195 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Water Treatments by Seachem

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500 mL
Conditioner

Purchase options and add-ons

Brand Seachem
Liquid Volume 500 Milliliters
Item Weight 8.5 Ounces
Item Form Liquid
Target Species Fish

About this item

  • POWERFUL TREATMENT: Seachem Prime is a complete and concentrated conditioner for both freshwater and saltwater fish tanks, working hard to remove chlorine and chloramine.
  • REMOVER: Seachem Prime immediately and permanently removes chlorine and chloramine, successfully allowing the bio filter to remove ammonia, nitrite, and nitrate while they are detoxified for 48 hours.
  • DETOXIFIER: Seachem Prime effectively detoxifies ammonia, nitrite, and heavy metals found in the tap water at typical concentration levels, providing a ideal environment for your betta, tetra, or other fish.
  • USE: Use 1 capful (5 mL) of Seachem Prime for each 200 L (50 US gallons) of new or replacement water. For best results, add Seachem Prime to new water first. For exceptionally high chloramine concentrations, a double dose may be used safely. For smaller volumes, use 2 drops per gallon.
  • SAFETY: In case of an emergency, the 5x dose of Seachem Prime may be used for both ammonia and nitrite. Use a ½ dose if the water temperature is > 30°C (86°F) and chlorine or ammonia levels are low.

Customer ratings by feature

Accuracy
4.8 4.8
Easy to use
4.7 4.7
Value for money
4.7 4.7
Stability
4.7 4.7

Customers usually keep this item

This product has fewer returns than average compared to similar products.

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Product Description

Seachem Prime is a complete and concentrated conditioner for both freshwater and saltwater fish tanks, working hard to remove chlorine and chloramine.

For over three decades, Seachem has been a company rooted in sound science. Our experience in the hobby and an educated staff of chemists and biologists are part of the package when you purchase Seachem products. Seachem remains as one of the few surviving independent and privately owned pet care companies. Seachem is owned and operated by
hobbyists. All of our employees are hobbyists who maintain aquariums at home and at the office. Seachem itself was started because one such passionate hobbyist - Dr. Leo G. Morin (Founder) - recognized that the available solutions to aquarists problem wanting. This resulted in Seachem’s very first product: Cupraplex (today known as Cupramine). Over thirty years later Seachem is still approaching old problems in a new way.

Seachem’s philosophy is that the knowledgeable hobbyist makes the best customer. This is reflected in solid and reliable customer education and support as well as products proven in science and performance. While Seachem has grown rapidly into a national and international firm, it retains the culture of a small company and is readily available to its customers.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 6.6 x 2.5 x 2.3 inches; 8.5 ounces
  • Item model number ‏ : ‎ 67104330
  • Department ‏ : ‎ men, women
  • Date First Available ‏ : ‎ June 20, 2004
  • Manufacturer ‏ : ‎ Seachem Laboratories, Inc.
  • ASIN ‏ : ‎ B00025694O
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.8 4.8 out of 5 stars 35,195 ratings

Important information

Directions

Prime is the complete and concentrated conditioner for both fresh and salt water. Prime removes chlorine, chloramine and 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. Prime also promotes the production and regeneration of the natural slime coat. Prime is non-acidic and will not impact pH. Prime will not overactivate skimmers. Use at start-up and whenever adding or replacing water. As part of their ongoing environmental stewardship efforts Seachem will donate a portion of the profits for every specially labeled edition bottle of Prime, Stability, Pristine, and Clarity (in Bonus Sizes of 325 mL -- 30% more) sold to a Rhino preserve in South Africa.

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Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
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Price-14% $18.49
List:$21.40
$36.90$14.24-20% $7.99
List:$9.99
$21.17-12% $35.97
List:$41.00
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Customer Ratings
Easy to use
4.7
4.7
4.8
5.0
4.5
4.8
Value for money
4.7
4.4
4.6
4.9
4.4
4.6
Stability
4.7
4.5
4.8
4.9
4.5
4.7
Accuracy
4.8
5.0
4.8
Sold By
Amazon.com
Pet Discounters
Sweetner
GiftsCircle
Amazon.com
WoWingPets
target species
Fish
Fish
Fish
Fish
fish
Fish
liquid volume
500 milliliters
500 milliliters
250 milliliters
50 milliliters
500 milliliters
1000 milliliters
form
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
weight
8.5 ounces
2.62 pounds
0.25 kilograms
2.4 ounces
1 pounds
2.58 pounds

Customer reviews

4.8 out of 5 stars
4.8 out of 5
35,195 global ratings

Customers say

Customers like the quality, value, and health of the aquarium pond water treatment. They mention that it works great for the aquarium, it eliminates chlorine, and it detoxifies ammonia and nitrite. They appreciate the water quality, ease of use, and concentration. That said, some complain about the smell.

AI-generated from the text of customer reviews

1,665 customers mention1,607 positive58 negative

Customers are satisfied with the quality of the aquarium pond water treatment. They mention that it works great for their aquarium and is extremely potent. Customers also say that it's reliable and the best tap water conditioner.

"Doing an emergency fish in cycle for my tank and this stuff is amazing...." Read more

"Works immediately and takes such a small amount compared to the competitors!! Prime is 100% necessary for any aquarium owner!" Read more

"This is the ultimate water conditioner. It eliminates chlorine. It also stabilizes your water. This company is outstanding." Read more

"...that from a personal stand point Prime is a great product and it works very well and if used correctly it can be very effective and affordable at..." Read more

459 customers mention430 positive29 negative

Customers are satisfied with the value of the aquarium pond water treatment. They mention that it is a great value compared to other such products, and well worth the price.

"...well and if used correctly it can be very effective and affordable at the same time." Read more

"This is some much cheaper than my local pet store i have been usomg this to treat my water for a year now and no issues." Read more

"...Covers some extra stuff. GREAT value for the bigger sizes." Read more

"...the keepers with smaller tanks like 5s, 10s, and 20s, it's a steal for the price. $20 every 2 years? Easy...." Read more

389 customers mention370 positive19 negative

Customers say the chlorine and chloramines in the aquarium pond water treatment product are great. They say it eliminates chlorine, which would kill the healthy bacteria in their tanks. They also say it removes all chemicals in tap water and doesn't alter the perimeters in their tank. Customers also mention that a few drops per gallon will neutralize the ammonia very well. They go on to say that it does a fantastic job of removing chlorine, chloramine, heavy metals, and detoxifying. Customers further praise the binders that render the resulting ammonium non-toxic.

"This is the ultimate water conditioner. It eliminates chlorine. It also stabilizes your water. This company is outstanding." Read more

"...Non acidic. Cheap is not always better. Def a must have for any aquarium owners" Read more

"...that take chlorine and chloramines out of the water and adds some beneficial bacteria. Get this!" Read more

"...Not only for neutralizing Clorine or Chloramide, it takes care of ammonia nitrate and nitrates! Do your research. Check Epic Aquarium for the facts...." Read more

243 customers mention227 positive16 negative

Customers are satisfied with the health of their fish, Amano shrimp, and assassin snails after using the aquarium pond water treatment. They mention that their fish are happy and healthy, and their aquarium is thriving. They also say that the product has helped keep their five tanks healthy for over a decade.

"...Congratulations! You have successfully completed a fish-in cycle." Read more

"...this on all my tanks, seems to be a quality product that does enough to reduce fish loss. I will keep buying it." Read more

"...Betta fish have healthier bubble nests after tank changes when using this product...." Read more

"...The water consistently tests perfect, and the fish as just fine. I've been doing this for 7 years now. It's good stuff!" Read more

205 customers mention205 positive0 negative

Customers are satisfied with the water quality of the aquarium pond water treatment. They mention that it takes chlorine and chloramines out of the water, making it super well-conditioned. They say that it makes water changes a breeze, and that it covers all water issues. Customers also say that the water stays crystal clear.

"...Our water chem levels are always consistent. I add and then let cycle for 24hours before testing. Highly recommend!" Read more

"...Otherwise, it's a great product and cleanses the tap water quickly!" Read more

"...The water consistently tests perfect, and the fish as just fine. I've been doing this for 7 years now. It's good stuff!" Read more

"All aquarist know this product. Great water treatment that take chlorine and chloramines out of the water and adds some beneficial bacteria. Get this!" Read more

140 customers mention131 positive9 negative

Customers find the aquarium pond water treatment easy to use. They mention that a cap is more than enough, it makes their job simple, and it works as it says it should. They say it's super easy to treat with and does a lot of heavy lifting. Fortunately, working out your new dosage is pretty simple. This product can save you some extra work and help you in general.

"...Fortunately, working out your new dosage is pretty simple – just add your nitrite and ammonia readings together...." Read more

"Works immediately and takes such a small amount compared to the competitors!! Prime is 100% necessary for any aquarium owner!" Read more

"...Easy to use and ready in no time to have your tap water conditioned to your fish...." Read more

"very easy to use does exactly what it says its going to do. This was my 3rd bottle ." Read more

113 customers mention106 positive7 negative

Customers are satisfied with the concentration of the aquarium pond water treatment. They mention that it is highly concentrated, and the 500ml bottle can treat 1000 US gallons of water. They also say that it helps keep their fish well and allows for more time.

"...so I made the switch I did notice that the stuff is very strong and concentrated so it doesn't take much to treat your water...." Read more

"...It's concentrated so that you only need a small amount per gallon. 1 capful treats 50 gallons!" Read more

"...I just I'm kind of flabbergasted. My goldfish are more active right now and I mean it's just been a couple of hours since I have added the three..." Read more

"...This stuff is really concentrated and lasts a long time!..." Read more

303 customers mention51 positive252 negative

Customers are not happy with the smell of the aquarium pond water treatment. They mention that it smells like sulphur and this is expected as it contains sulfur.

"Smells horrible as it's bacteria but works sooo good" Read more

"...It does have a sulphuric smell to it with the chemicals that are in it, so just a bit of a warning to those who may be sensitive to certain smells...." Read more

"...It is somewhat hard to measure out. Note: this product contains sulfur and smells slightly from the bottle but does not cause the tank to smell." Read more

"Easy to use and does what it is supposed to. Smells horrid but it works" Read more

Works wonders
5 Stars
Works wonders
Doing an emergency fish in cycle for my tank and this stuff is amazing. Can get me through the trials of being a new fish owner and keep him safe till healthy bacteria is established in my tank.Performing Emergency fish-in cycle with Seachem PrimeStep 1: Set up your aquariumIt’s time to set up your aquarium. And, that includes all the equipment – heaters, filters, air pumps… Get it in there! Don’t forget to rinse it with fresh water first!The beneficial bacteria need a surface to cling to, namely your substrate and filter media. So by setting everything up, you give your bacteria as many surfaces as possible to cling to.Add water to the tank, and don’t forget to dechlorinate it with your water conditioner first.Finally, you want to keep all electrical equipment, such as heaters, filters and bubblers, switched on throughout the entire cycling process. Not only will this keep your fish as comfortable as possible, but it will also make your tank cycle faster.Want to cycle your tank as quickly as possible? Check out FishLab’s tips for speeding up the cycling process.Step 2: Adding your fishBefore you add your fish, you want to acclimate them first. This will give them the best chance of survival.You want to feed your fish throughout the cycling process… You don’t want them to starve!When feeding your fish, however, it’s important that you don’t feed them too much. The more you feed them, the more they are going to poop. And the more they poop, the faster your ammonia levels are going to rise.Also, remove any uneaten food from the tank, a good aquarium net will make this easy. Any uneaten food left behind will break down into ammonia, causing the levels to rise.If a fish dies during the cycle, remove it from the aquarium ASAP. Its decaying body will also give off ammonia. Don’t panic if one of your fish dies. It doesn’t necessarily mean that all your fish will – this one might have been extra sensitive.Step 3: Test, test, test, and test againNow, use your ammonia test kit every 24 hours.What you are looking for is any sign of ammonia. Trust me. It won’t be long before it appears.Once your test kit returns positive for ammonia, it’s time to move to the next step.Step 4: Dealing with ammoniaOnce you detect ammonia, it’s time to start dosing with Seachem Prime. Follow the instructions on the bottle to determine what a single dose would be for your tank – the larger the aquarium, the more Prime you will need. Fortunately, a little goes a long way, and many of you will find that a single bottle of Prime will get you through an entire cycle.For this method, Seachem Prime is the most important ingredient. You see, a dose of Prime will bind ammonia, nitrite and nitrate for 24 to 48 hours, making them harmless to your fish.Picture Seachem Prime locking up ammonia, nitrite and nitrate in a jail cell for up to 48 hours. While in the cell, these nasties cannot harm your fish. However, once their time is up, and they are released, they will once again attack your fish.It is for this reason that you need to dose regularly with Seachem Prime, to keep these nasties locked up.A single dose of Prime will treat up to 1 part per million (ppm) of ammonia. Prime can be dosed up to 5 times safely. So, 2 ppm of ammonia can be treated with two doses of Prime, 3 ppm can be treated with three doses, and so on.Anything less than 1 ppm should be treated with a single dose. Between 1 ppm and 2 ppm, two doses. You get the idea. Oh, and it goes without saying that it’s better to overdose than underdose.*Once your test kit reads 2 ppm of ammonia, you should perform a 50% water change. This should cut your ammonia levels roughly in half. Repeat this process until you notice that your ammonia levels are not rising as quickly as before. Typically, this will take a week or two. When this happens, you are ready to move to the next step.Bookmark this page so that you can easily find it when you are ready for the next step!Step 5: Nitrites start to appearNext, you need to test for nitrites. If none are present, keep repeating the previous step and testing for nitrites daily until you get a positive result.Now that nitrite has entered the equation, you need to make sure you are dosing with enough Prime to protect your fish from both ammonia and nitrites.Fortunately, working out your new dosage is pretty simple – just add your nitrite and ammonia readings together.Let’s say your test returns the following…Ammonia 0.25 ppmNitrite 1.5 ppmAdding the two together will give you a total of 1.75 ppm. A double dose of Prime will take care of it.This time, if your combined ppm of ammonia and nitrite reaches 4, perform a 50% water change.Keep repeating this. You will eventually notice that your ammonia drops to zero. This is a good thing – bacteria are eating the ammonia as quickly as it is being produced, resulting in a zero reading.Continue daily dosing and testing for ammonia and nitrites. Once your nitrite levels stop rising as quickly, you are ready for the next step.Step 6: Nitrates appearNow, you want to test for nitrates. If none are present, keep repeating the previous step and testing for nitrates daily until you get a positive result.Once nitrates are present, you are nearing the end (woohoo!). Continue testing for ammonia, nitrites and nitrates. Your ammonia levels should still be zero, and your nitrite levels should be declining.Keep dosing with Prime until both your nitrite and ammonia levels are zero. At this stage, the beneficial bacteria are eating them as quickly as they are being produced.Congratulations! You have successfully completed a fish-in cycle.
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Top reviews from the United States

Reviewed in the United States on May 2, 2021
Size: 500 mLStyle: ConditionerVerified Purchase
Customer image
5.0 out of 5 stars Works wonders
Reviewed in the United States on May 2, 2021
Doing an emergency fish in cycle for my tank and this stuff is amazing. Can get me through the trials of being a new fish owner and keep him safe till healthy bacteria is established in my tank.
Performing Emergency fish-in cycle with Seachem Prime

Step 1: Set up your aquarium
It’s time to set up your aquarium. And, that includes all the equipment – heaters, filters, air pumps… Get it in there! Don’t forget to rinse it with fresh water first!
The beneficial bacteria need a surface to cling to, namely your substrate and filter media. So by setting everything up, you give your bacteria as many surfaces as possible to cling to.
Add water to the tank, and don’t forget to dechlorinate it with your water conditioner first.
Finally, you want to keep all electrical equipment, such as heaters, filters and bubblers, switched on throughout the entire cycling process. Not only will this keep your fish as comfortable as possible, but it will also make your tank cycle faster.
Want to cycle your tank as quickly as possible? Check out FishLab’s tips for speeding up the cycling process.

Step 2: Adding your fish
Before you add your fish, you want to acclimate them first. This will give them the best chance of survival.
You want to feed your fish throughout the cycling process… You don’t want them to starve!
When feeding your fish, however, it’s important that you don’t feed them too much. The more you feed them, the more they are going to poop. And the more they poop, the faster your ammonia levels are going to rise.
Also, remove any uneaten food from the tank, a good aquarium net will make this easy. Any uneaten food left behind will break down into ammonia, causing the levels to rise.
If a fish dies during the cycle, remove it from the aquarium ASAP. Its decaying body will also give off ammonia. Don’t panic if one of your fish dies. It doesn’t necessarily mean that all your fish will – this one might have been extra sensitive.

Step 3: Test, test, test, and test again
Now, use your ammonia test kit every 24 hours.
What you are looking for is any sign of ammonia. Trust me. It won’t be long before it appears.
Once your test kit returns positive for ammonia, it’s time to move to the next step.

Step 4: Dealing with ammonia
Once you detect ammonia, it’s time to start dosing with Seachem Prime. Follow the instructions on the bottle to determine what a single dose would be for your tank – the larger the aquarium, the more Prime you will need. Fortunately, a little goes a long way, and many of you will find that a single bottle of Prime will get you through an entire cycle.
For this method, Seachem Prime is the most important ingredient. You see, a dose of Prime will bind ammonia, nitrite and nitrate for 24 to 48 hours, making them harmless to your fish.
Picture Seachem Prime locking up ammonia, nitrite and nitrate in a jail cell for up to 48 hours. While in the cell, these nasties cannot harm your fish. However, once their time is up, and they are released, they will once again attack your fish.
It is for this reason that you need to dose regularly with Seachem Prime, to keep these nasties locked up.
A single dose of Prime will treat up to 1 part per million (ppm) of ammonia. Prime can be dosed up to 5 times safely. So, 2 ppm of ammonia can be treated with two doses of Prime, 3 ppm can be treated with three doses, and so on.
Anything less than 1 ppm should be treated with a single dose. Between 1 ppm and 2 ppm, two doses. You get the idea. Oh, and it goes without saying that it’s better to overdose than underdose.
*Once your test kit reads 2 ppm of ammonia, you should perform a 50% water change. This should cut your ammonia levels roughly in half. Repeat this process until you notice that your ammonia levels are not rising as quickly as before. Typically, this will take a week or two. When this happens, you are ready to move to the next step.
Bookmark this page so that you can easily find it when you are ready for the next step!

Step 5: Nitrites start to appear
Next, you need to test for nitrites. If none are present, keep repeating the previous step and testing for nitrites daily until you get a positive result.
Now that nitrite has entered the equation, you need to make sure you are dosing with enough Prime to protect your fish from both ammonia and nitrites.
Fortunately, working out your new dosage is pretty simple – just add your nitrite and ammonia readings together.
Let’s say your test returns the following…
Ammonia 0.25 ppm
Nitrite 1.5 ppm
Adding the two together will give you a total of 1.75 ppm. A double dose of Prime will take care of it.
This time, if your combined ppm of ammonia and nitrite reaches 4, perform a 50% water change.
Keep repeating this. You will eventually notice that your ammonia drops to zero. This is a good thing – bacteria are eating the ammonia as quickly as it is being produced, resulting in a zero reading.
Continue daily dosing and testing for ammonia and nitrites. Once your nitrite levels stop rising as quickly, you are ready for the next step.

Step 6: Nitrates appear
Now, you want to test for nitrates. If none are present, keep repeating the previous step and testing for nitrates daily until you get a positive result.
Once nitrates are present, you are nearing the end (woohoo!). Continue testing for ammonia, nitrites and nitrates. Your ammonia levels should still be zero, and your nitrite levels should be declining.
Keep dosing with Prime until both your nitrite and ammonia levels are zero. At this stage, the beneficial bacteria are eating them as quickly as they are being produced.
Congratulations! You have successfully completed a fish-in cycle.
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