Skip to main content
Best Seller

Seachem Prime Water Conditioner by Seachem

  • $5.99
  • Save $3SALE (50%)
In Stock - FREE shipping over $75
SKU: SC04340
UPC: 000116043403
MPN: 434
  • $7.99
  • Save $3SALE (43%)
In Stock - FREE shipping over $75
SKU: SC04350
UPC: 000116043502
MPN: 435
  • $48.99
  • Save $23SALE (47%)
SKU: SC04350M
UPC: 685167894657
MPN: 04350M
  • $16.99
  • Save $8SALE (46%)
In Stock - FREE shipping over $75
SKU: SC04360
UPC: 000116043601
MPN: 436
  • $31.99
  • Save $15SALE (45%)
In Stock - FREE shipping over $75
SKU: SC04330
UPC: 000116043304
MPN: 433
  • $104.99
  • Save $53SALE (50%)
In Stock - FREE shipping over $75
SKU: SC04360P
UPC: 685457294457
MPN: 04360P
  • $99.99
  • Save $50SALE (50%)
In Stock - FREE shipping over $75
SKU: SC04330M
UPC: 689481965222
MPN: SC04330M
  • $62.99
  • Save $30SALE (47%)
In Stock - FREE shipping over $75
SKU: SC04370
UPC: 000116043700
MPN: 437
  • $125.99
  • Save $63SALE (50%)
In Stock - FREE shipping over $75
SKU: SC04370N
UPC: 681541104862
MPN: 04370N
  • $109.99
  • Save $55SALE (50%)
SKU: SC04380
UPC: 000116043809
MPN: 438
  • $218.99
  • Save $115SALE (53%)
SKU: SC04380N
UPC: 681541149412
MPN: 04380N
  • $196.99
  • Save $104SALE (53%)
In Stock - FREE shipping over $75
SKU: SC04390
UPC: 000116043908
MPN: 439
  • $372.99
  • Save $195SALE (52%)
In Stock - FREE shipping over $75
SKU: SC04390N
UPC: 681541056352
MPN: 04390N
  • $676.99
  • Save $355SALE (52%)
In Stock - FREE shipping over $75
SKU: SC04310
UPC: 000116043106
MPN: 431

Seachem Prime Water Conditioner Description

Seachem Prime is the complete and concentrated conditioner for both fresh and saltwater aquariums. Use during startup and water changes to eliminate and detoxify harmful chemicals in tap water and make your aquarium safe for fish.

  • Removes chlorine, chloramine and toxic ammonia
  • Detoxifies nitrite and nitrate
  • Provides protective slime coat

Prime is safe for fresh and saltwater aquariums. It detoxifies ammonia, nitrite and nitrate, allowing the biofilter to more efficiently remove them. Use Sechem Prime to detoxify any heavy metals found in the tap water at typical concentration levels. Prime also promotes the production and regeneration of the natural slime coat. Seachem Prime is non-acidic, will not impact pH and will not overactivate skimmers.

Use at startup and whenever adding or replacing water. Prime may also be used during tank cycling to alleviate ammonia/nitrite toxicity.

Directions: Use 1 capful (5 ml) for each 200 L (50 gallons) of new water. This removes approximately 1 mg/L ammonia, 4 mg/L chloramine, or 5 mg/L chlorine. For smaller doses, please note each cap thread is approx. 1 ml.

Tips: 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.

You May Also Like

Seachem Prime Water Conditioner Customer Reviews

Brittny, Simi Valley CA on 2016/09/12
Love it

My tank gets filthy fast, due to not having such great water to begin with, and having cichlids, which seem to be dirty fish. This is the only product I've found that helps keep my tank clean and clear, in between water changes.

Melissa, Moreno Valley CA on 2016/06/29
Best water conditioner ever

I've been using prime for quite a while now ever since I started keeping fish again last year and it is by far the best water conditioner there is and it lasts a long time too. Petmountain has a great price too! Highly recommended.

Teddy, Cincinnati OH on 2016/01/13
Best to use

One of my favorite water conditioners to use for my fish, a little goes a long way and this stuff lasts for ages.

Michael , Corpus Christi TX on 2015/10/21
Great value

Great value compared to the stores. Almost half the price for way more.

Richard, Stockton CA on 2015/07/30
Very Little Needed

Seachem makes great products and this is one of them. Costs a little more but a little goes so much farther than what I was using.

Judy, Bradenton FL on 2015/07/01

I keep Prime on hand at all times. I like the fact that it will not harm the fish if too much is accidentally used. With as many fish that I have I always have Prime and since a recent unknown issue with my pond, I now always have Stability.

Chami, Torrance CA on 2015/04/15
Best water conditioner

Removes chlorine, chloramine and ammonia. Detoxifies nitrite and nitrate. Only concern is the bottle shape. Should come up with lid that can take drops, because it's 5ml for 50 gal. But works great.

Therese, Schertz TX on 2014/10/15
Seachem Prime Water Conditioner

Have been using Seachem Prime Water Conditioner for years because it IS the top of the line, and has always worked the best for every aquarium I have ever had since I became an aquarium lover. I now have 5: salt, fresh and brackish, as well as a pond outside, and only use and recommend Seachem Prime Water Conditioner.

Efrain, Winter Garden FL on 2014/10/06

The best water condition in the market, just 2 drops per gallon and you're set.

Mac, Pine CO on 2013/12/24
Prime is a MUST OWN

If you are searching through the different brands on this website and reading reviews on which brand is the BEST water conditioner, let me do you a favor and stop you right now. Congratulations! You have found it! Ask anyone who is semi serious about this hobby and you'll know Seachem products are the best. Get this. I wouldn't dare use any other brand. I've even bought Prime for work colleagues who were using inferior brands (ie ALL of them) and they are converted too. Add it to your cart with confidence.

Jackie Oneil, Manhattan KS on 2013/11/13
Dont want to be without PRIME!

My water quality is horrible in Kansas. I only trust PRIME in my tanks and Pet Mountain has the best price on it.

Geri, Arlington WA on 2013/11/12

I have used Prime water treatment in my 5 tanks for years. It came highly recommended from many different fish hobby sites on the Web. It has worked well in my tanks so I stick with it, why fix what isn't broke.

Patrick, Madison WI on 2013/09/19
This is my favorite

I find this product from Petmountain to be great, and more economical than similar products to detoxify water. I used to buy the 500ml container for myself, but this time I bought the 2-liter bottle for my father in-law and myself. It is significantly more expensive compared to the smaller size, but in the long run, it is cheaper. I used this product all year round. It is almost like a must-have to me.

Austin, Gainesville FL on 2013/06/14
Just a plain necessity

This is a great deal for water conditioner. It's a necessity for any size home aquarium!

Danny, Chicago IL on 2013/06/06

Great stuff. One cap full treats 50 gallons. Will bring ammonia, nitrates, nitrites to zero! A must have. Takes place of many treatments, its an all-in-one.

Clarice, Vine Grove KY on 2013/02/13
Prime Water Conditioner

This is by far the best water conditioner I have ever used, and when my supply becomes low I will definitely be ordering it from Petmountain again. A must for your tank.

Keith, Tylertown MS on 2013/01/08
Great Products from Seachem

I use a lot of seachem products for plants, water buffering, filter products, monitors,chlorine removal and lots more. As always seachem products are top of the line. Simply put, they work.

Glitched, Independence MO on 2012/12/31
Great Product

I have been using this since I first realized what all was involved with basic fish care. It is the best product, hands down. Combine that with the fact that it only takes a few drops to equal what most other manufacturers take 5 to 10 mL to do, it's very cost effective. I wouldn't use anything else.

Kat, Tri-Cities TN on 2012/06/27
Prime is the best water conditioner!

It works for the bad stuff (Chlorine, Chloramine and Ammonia) that might be in your tap water. It's more concentrated so you use less. Also, in an emergency, if you happen to have an ammonia or nitrite spike you can use a much higher dose without adverse effects until you can do a water change. It's a great value for a great product.

Cynthia, Bloomfield NJ on 2012/01/20
Prime Conditioner - nothing comes close

As a breeder and hobbyist, I only use Prime Water Conditioner for my tanks and ponds. I will never switch to another brand. Very cost efficient, very reliable. I normally buy 2 bottles of 4L Prime every few months. Really glad to have found this at PetMountain at the lowest price possible.

Olga, Miami FL on 2011/10/26
The best I tried so far

This product is all you need, it really delivers. You will love it :)

Alli, Metairie LA on 2011/09/08
Prime definitely works

This red bottle Seachem prime really works. The price is good and shipping always on time from vendor, no problems. I have used other products, but for the water type here plus the rain, this really balances the water that can turn green quick

Alan, Arlington Heights IL on 2011/05/05
Great Buy

Seachem Prime is probably the most effective water conditioner available for the price. A small capfull is all I need for each water change. Buying the larger bottles is even more cost effective, since the 2L bottle will last me around a year or so.

David, Rancho Santa Margarita CA on 2011/02/05
The Best Water Conditioner

Took me awhile to switch from Amquel to Prime, but I'm glad I finally did. Very cost effective. The majority of hobbyists I've met have use Prime.

Darwin , Los Angeles CA on 2010/10/21
Best water treatment ever!

I have been using Seachem (seachem makes the best stuff out there)Prime ever since I heard about how great it was. I used a lot of the other popular stuff, but none of them offered what Prime does. Prime will not only take less to condition the water it also helps lower Ammonia, Nitrites and Nitrates and can be used to treat sudden spikes by double dosing (per instructions on bottle). Simply put: don't waste your money on the other stuff, use Prime and done!

Fontosa Nut , Cape MA on 2010/06/06

been a aquarium keeper for over 20 years and wouldn't use any other additive keep my tank in balance and healthly ... also can not beat the pet mountain price!

Anna, Lexington KY on 2010/02/08
By FAR the Best Water Conditioner for ANY use!

I have sold and raised fish professionally and ALWAYS recommend PRIME to everyone I know - It not only goes far - this bottle treats 5,000+ gallons, but it reduces Ammonia, Nitrites and Nitrates all in one swoop! WHAT A MIRACLE! When you have large tanks, you need something that goes far and doesnt cost a lot! This is amazing! 5*****!

Barlow, Greeley CO on 2009/12/30
SeaChem Water Additives

Have used the SeaChem "Stability" and "Prime" water additives for a number of years. Frankly, I wouldn't use anything else. My pet shop associate recommended these products when I was setting up my first tank and five tanks later, I'm still using these products with exceptional results.

Slm, New York NY on 2009/10/08
All Seachem products are excellent

I am long familiar with Seachem products and bought from petmountain for the great discount, and wonderful customer service.

Chuck, Dewitt NY on 2008/01/27
Great Project--Low Price

I have been using Prime for several years as a total water conditioner. It does the job well and is easy to use. An additional benefit is that it costs only a fraction of what other total water conditioners cost. Great Product--Great Price--It works for me.

Chuck, Dewitt NY on 2008/01/27
Great Project--Low Price

I have been using Prime for several years as a total water conditioner. It does the job well and is easy to use. An additional benefit is that it costs only a fraction of what other total water conditioners cost. Great Product--Great Price--It works for me.

Kara, Melbourne FL on 2007/11/06
This is a wonderful product!

Prime works very well. It's concentrated so you don't have to use as much as many other brands, and it takes care of almost any concern one would treat water for. It makes water changes a breeze.

Ellen, Hollywood FL on 2007/08/20
healthy tanks and pond

We have used Prime for years in our tanks and it has kept the water properly conditioned. We are now using it in our Koi Pond and we have very happy Koi.

Customer, Tally FL on 2007/07/28

Seachem Prime is 5x more concentrated than Amquel+. Use 1.5 drops (or roughly 2 drops) per gallon to initiate new tank water. After this, add 1 drop per gallon each day for the first week of starting a new tank, with no fish in it, then add 1 drop per gallon twice a week after that until nitrogen cycle kicks in.

Rick, Milpitas CA on 2007/01/28
Prime, Seachem

I think this product is great. It helps a lot with conditioning the tap water that we get in Milpitas. I highly recommend the product.

David, Princeton NJ on 2006/11/06
Excellent tap water treatment for chloramine

My tap water has cloramine and not chlorine. I used Stress Coat, which raised my ammonia level because it split the cloramine into chlorine and ammonia. Prime is expensive, but a 500ml bottle should last you more than a year if you have a 20-40 gal, and do 10 percent water changes a week.This product treats chlorine, chloramine, nitrates, and nitrites. Also, adds slime coat protection to fish. Great product, will always use this.