Prime - 16.9 oz.

SKU: 198671
Manufacturer: Seachem
MPN: 433

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Prime is the complete and concentrated conditioner for both fresh and salt water. Prime removes chlorine, chloramine and ammonia. Ammonia is converted into a safe, non-toxic form that is readily removed by the tank's biofilter. This product 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 also promotes the production and regeneration of the natural slime coat. This product is non-acidic and will not impact pH. Use at start-up and whenever adding or replacing water.

Treats 5000 gallons


Package Size16.9 oz.
Treats up to5000 gal.
Internal Id


Contains: proprietary aqueous solution of complexed hydrosulfite salts.


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. 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.

Ratings & Reviews

7 reviews

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Hands Down The BEST conditioner on the Planet


Just about every major manufacture and boutique specialty company has a water conditioning and treatment product.

I can't say I've tried them all, but close too it. Some products have at the least, minimal effectiveness while others can be potentially dangerous.

I've been using Amquel for years and it's a fine conditioner, excellent at removing chlorine, and Chloramines, but like all of these products - they come with limitations.

Well, with one exception and that's Prime by Seachem

.A few months ago, I decided to give it a try, and haven't looked back since. Prime doesn't just remove the chlorine and Chloramine it does much more:

* Detoxifies any and all heavy metals in your tap water
(you can contact your water company directly for a list of them and PPM)

* Neutralizes Ammonia

* Neutralizes Nitrite

* Neutralizes high Nitrate to non toxic levels

* Removes toxic gases

* Will not foam or change PH

* Helps regenerate natural slime coat

Since using Prime, I've seen improvement in all of my fish. In 2010 one of my tanks was hit with the dreaded and rare Toxic Tank Syndrome (see horror stories) within 48 hours I had lost nine gorgeous fish - except for one survivor, a single Broad Tail Nymph.

Since that ordeal, "Roxy" became a bottom dweller spending most of her time laying in a corner. Treatments were conservative, but nothing worked.

After my first 50% water change using Prime her behavior began to improve.

Now she swims among her tank mates, her color is a gorgeous deep velvet black ( they have such tiny scales they look like velvet) her appetite is ferocious - she's the picture of health (knock on drift wood)

In fact I see improvements in all my fish and in every tank
There simply isn't anything like it, Prime is hands down one of the best things you can do for your fish
In addition to the outstanding, patent pending formula of Prime - it couldn't be more economical to use.A single 500 ml bottle treats up to a whopping 5,000 gallons of water. A tiny bit goes a long, long way.

It should also be noted that in times of emergency the dose can be increased five times, Prime is harmless to fish.

It's the only product of it's kind, and towers above any other water treatment on the market - period.

I would urge anyone to add a bottle of Prime to your arsenal of fish care products - Your finned friends will thank you for it.



Nothing in the market can & will not come close. To the fast & amazing results you get from prime. With the little you put in. Purchase both the stability & prime along with stress guard what a power house. Your weekly readings will be at 0ppms. As long as you do your part also.

Only Water Conditioner To Consider


If you have been in the hobby for long, you know the importance of a good conditioner. This one is the best.

the best


the best water conditioner on the market, the fact that it detoxifies heavy metals is a big plus for someone who lives in a city where some of the mains are 200 years old and the pipes are made of a lot of different metals

Prime #1


I switched to Prime when another brand I was using didn't seem to be doing it's job very well. After using Prime I noticed the water was more stable and is easier to keep nitrate and nitrite levels lower (nitrate at 0).



great stuff at an amazing price than the other shop!!



this is THE water conditioner to have. others are good too, but this is the best i ever used.