Sea Salt for Marine Aquariums, 50 Gallons | Formulated For Marine Aquariums With Trace Elements for Marine Fish & Invertebrates, Dissolves Fast, Maintains Ideal pH

Happy with purchase. Works well for my intended use.

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.

Great value.

Best sea salt to use

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!

Mixed with RODI with 0-3 TDS it makes a perfect concentration of electrolytes/salinity for my mixed reef tank. Dissolves quickly in water. Bulk sizing is a great money saver. Fish are alive and well, but I still recommend pre mixing a few hours in advance before a water change.

I've used instant ocean for almost 40 years, from fish to reefs never had any issues. For those who say it sometimes clumps, all salt mix does that it's just humidity or moisture getting into bag, the older and longer you have it the better the chance. I stopped using the buckets because it almost always clumped. Doesn't hurt the salt as long as it's just humidity. It just takes a bit longer to break down. I make my saltwater with RODI water and make it at least 24 hours in advance and run a powerhead or other pump in it till it's clear I think it's less stress of livestock. Been in saltwater fish and reefs for over 45 years. It's all I use.

Came as described. Easy to use and clesr instructions.

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.