Instant Ocean Sea Salt for Aquariums

By Instant Ocean
Rated 4.7209 out of 5 stars


Selected: Size:


Selected: Size:

$56.90 (-30%)Chewy Price
$81.29Chewy Price
Or save an extra 5% with
$54.06Autoship Price

Why Autoship?

  • Save 5% on all future Autoship orders
  • Set your schedule based on your pet's needs
  • No fees, no commitments - skip, change or cancel anytime.

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FREE 1-3 day delivery

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.

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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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This Item – Instant Ocean Sea Salt for Aquariums, 200-gal
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Instant Ocean Testing Hydrometer for Aquariums, 1 count
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Fish TypeMarine Fish, Marine InvertebrateMarine Fish, Marine InvertebrateMarine FishMarine FishMarine Fish, Marine Invertebrate
Aquarium TypeSaltwaterSaltwaterSaltwater, FreshwaterSaltwaterSaltwater

Questions & Answers

9 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 4.7209 out of 5 stars
86 Ratings
Would recommend to a friend

80 Customer Reviews

Rated 5 out of 5 stars
By Susan on Dec 4, 2023

Instant Ocean

Very pleased with the order. Good price and I needed it asap and it came with no delays as promised.

Rated 5 out of 5 stars
By Jaye on Jul 6, 2023


My sea salt was delivered on time. Also and most importantly the the bag the sea salt came in was perfect no holes or leaking sea salt.. I really didn’t know how much sea salt it took to make 50 gal’s, but I am glad I found this bag at chewy because I won’t be needing any sea salt for my newest pets for a very long time. My 7 hermit crabby’s would thank you if the could.

Rated 5 out of 5 stars
By JP on Aug 9, 2023

Great value is waiting

Lucky to buy during special offer of 4 for price of 3 boxes. Excellent value and quick delivery!

Rated 5 out of 5 stars