Instant Ocean Sea Salt for Aquariums

By Instant Ocean
Rated 4.6857 out of 5 stars
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Instant Ocean Sea Salt for Aquariums, 160-gal slide 1 of 6
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Instant Ocean Sea Salt for Aquariums, 160-gal slide 1 of 6

$37.99Chewy Price
$79.99Chewy Price
$36.09Autoship Price
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About This Item

  • Sea Salt that provides marine fish, invertebrates and plants the major, minor and trace elements they need.
  • Can be added to ordinary dechlorinated tap water or purified water as a close match to natural seawater.
  • Contains every major, minor and trace element necessary for the health of even the most delicate fish.
  • Simply stir and then aerate and be sure to test for proper salt level for the best results.
  • Creates an ideal marine environment with no nitrates or phosphates.
Play Video: Learn More About Instant Ocean From Our Team of Experts
Learn More About Instant Ocean From Our Team of Experts

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Fish TypeMarine Fish, Marine InvertebrateMarine Invertebrate, Marine FishMarine FishMarine FishTropical Freshwater, Marine Fish, Marine Invertebrate
Aquarium TypeSaltwaterSaltwaterSaltwaterSaltwaterFreshwater, Saltwater

Questions & Answers

8 Customer Questions

How much salt do I put for a 29 gallon tank
Answer by ChewyMar 25, 2020
For tanks between sizes, we recommend the next largest size. Please click on the attached photo for detailed instructions.

Can this be used with invertebrates
Answer by ChewyDec 28, 2018
This product can be used with invertebrates but it should never be mixed in an aquarium containing animals. Always transfer animals to the aquarium after salt is completely mixed and aerated and specific gravity has been adjusted. To facilitate the growth of corals and other invertebrates in a reef aquarium, it's recommended to use Reef Crystals® instead.

Could this be used for a brackish tank?
Answer by ChewyJul 05, 2018
This product can be used in all saltwater aquariums.

Could this be used like freshwater aquarium salt? Just trying to treat fish and need bulk amounts as the small API freshwater salt doesn’t last me.
Answer by ChewyMay 24, 2019
This Instant Ocean Sea Salt for Aquariums is engineered to provide the closest match to natural seawater for your marine aquarium. Instant Ocean is not intended to be used for a freshwater aquarium.

ReviewsWrite a Review

Rated 4.6857 out of 5 stars
70 Reviews
Would recommend to a friend

70 Customer Reviews

Rated 5 out of 5 stars
By TimR on May 25, 2022

Goes on sale after I order......

Wasn't notified that this was going to be on sale literally 12 hours after I purchased a 200 gallon case. Kinda irritating they didn't send me any email to my account....I would have waited the few hours to place the order to save some more especially since everything is so expensive right now.

Rated 5 out of 5 stars
By Killerkiefer on Apr 6, 2022

Great Product, Great Value!

I ordered this to start my saltwater aquarium. No issues and very easy to use. Also, less expensive than most pet stores!

Rated 5 out of 5 stars
By RandomProjectsWithSam on Mar 24, 2022

does the job!

seems to mix clean! just needed a little more mix time then my usual... TMPTG (TropicMarinProTurkishGold)

Rated 5 out of 5 stars
By Happy on Jan 21, 2022

Works well

This stuff works well . And chewy is the best . I order all the time from them and they have the best products.. fast shipping. An amazing customer service.. I can always depend on chewy.

Rated 5 out of 5 stars
By RayE on Mar 12, 2022

Instant Ocean Purchase

Everything went well with the purchase. The Instant Ocean package arrived on time and in good condition.

Rated 5 out of 5 stars
By John on Oct 30, 2021

Good Reliable Salt

For a marine fish and invert. aquarium, this is a good reliable sea salt. I do add a number of chemicals and trace elements at the time of the bi-weekly water changes. I carry a heavy load of Info-Pacific and Red Sea fish, some a old as 9 to 10 years - all in good health. Hold good steady levels of PH and ORP. The price remains reasonable.

Rated 5 out of 5 stars
By LarryK on Jan 11, 2022

Good stuff

I've been using this salt for over 30 years. Absolutely no reason to look for any other brand. This stuff has been around forever.

Rated 5 out of 5 stars
By arick56 on Feb 8, 2022

Good price and quantity

I like to shop in Cewiy I get best prices Me gusto y a bueno precio

Rated 5 out of 5 stars
By Rick on Dec 1, 2021
Top 1000 Contibutor

The only salt I use

I have used Instant Ocean Sea Salt for decades. It is consistent, reliable and the only sea salt I use.

Rated 5 out of 5 stars
By bruce on Mar 14, 2021


You will not find a brand of marine salt more on sale or at a cheaper price than this one. In my opinion, there is not a large difference from one brand to the next to justify the higher price. If you have finicky saltwater fish then some of the more expensive brands claim that the stated amount of ingredients is more consistently correct compared to other brands. If true these might be worth the higher price. I keep coastal fish that are used to changing conditions (input from rivers, surface runoff, bays/lagoons/estuaries where there is constant flux) so I don't need the super correct ingredients.