Sea Salt 50 Gallons, For Marine Aquariums, Fast Dissolving

Instant Ocean Sea Salt 50 Gallons is a dependable, fast‑dissolving mix that makes water changes simple and consistent, producing clear, stable saltwater within minutes and maintaining reliable pH, alkalinity, and trace elements for healthy marine fish and invertebrates. It’s clean, easy to measure, and mixes without residue or cloudiness, which is great when you need water ready quickly. The blend is ideal for fish‑only or beginner reef setups, offering strong value without the premium price tag of specialized reef salts. While advanced coral keepers may supplement calcium or magnesium depending on their tank’s demands, the overall performance, affordability, and long‑term consistency make this salt mix a trustworthy choice for everyday marine aquarium care.

I used to own a tropical fish shop, a commercial FW fish breeder and now just a retired hobbyist. I only use Instant Ocean salts to hatch and/or grow Brine shrimp now. I have always obtained superior hatches using marine salt mixes over rock salt. In the past, I've cultured some corals but a true measure of a marine salt mix is to have reef fish breed in captivity. I have had pairs of Yellowtail Blue Damsels, Chrysiptera parasema) breed almost every week for months at a time in the early 1980's. In a different setup in the late 1980's and early 1990's I had a 125 gal reef tank. Mostly corals with a few fish. In that tank, my pair of Pygmy Flame Angelfish, Centropyge loricula and trio of Mandarin Dragonets, Synchiropus splendidus, would regularly spawn just after the lights turned off. Of course, I never successfully raised any young because that is too difficult if one is landlocked with no access to tropical plankton to fee the young but some have been successful in tropical Pacific and Caribbean ora.com facilities. Most major public and commercial marine aquariums use Instant Ocean because it has high predictable quality at reasonable prices.

Happy with purchase. Works well for my intended use.

Super product will definitely always purchase this product great for hermit crabs koi fish anything that needs safe salt in their water.

This is the 2nd bag we have bought in the past year for my son’s 3 saltwater tanks. It keeps the water quality and ammonia levels where it should be. This is quick to react and doesn’t affect the color of the water. Keeps fish tanks healthy. Will buy again!

This is my go to for my hermit crab's salt water pools. It dissolves easily and doesn't have weird bits left behind when mixed like another brand I've tried. Might get a bucket of it, or get a bucket to store the bag in next time as any humidity turns it into a brick. But that's on me.

Work great my fish love it I love it

i like this salt however if you want to go longer between dosing for coral or water changes id recommend reef crystals instead

Tengo cuarenta años manteniendo acuarios marinos de todo tipo, Instant Ocean y la sal que de las salineras de Lorena, Francia obtienen con adición de sintéticos me ha acompañado todo ese tiempo sobre todo cuando hay épocas en donde requieres un precio económico, ya que la acuariofilia marina no es para cualquiera por los costos que en cualquier momento enfrentas, el contar con sal de emergencia es obligatorio y desde siempre he contado con bolsas de reposición sin importar cuando las use, de tener hace unos veinticinco años un tanque de 1,000 GA pase gradual y lentamente a los tanques NANO con el ahorro en recursos, energía y especímenes para ir de la mano con una política de planeta sustentable y ahí estuvo Instant Ocean y seguirá hasta donde mi afición me lo permita.

Been using this line of salt from instant ocean for about 2 years now, very good product and the salinity instructions on the back are very accurate,

Llego rapido y a buen precio, gracias!

Not sure if it was due to moisture but the salt started to clump together

It's salt. I use it for my hermit crabs. This box will last me 20 years. It does harden into a solid block but I just chisel pieces off, which is sorta fun.