aquarium salt vs epsom salt

Aquarium salt vs Epsom salt

Aquarium salt and Epsom salt are two common salts often used for different purposes in the aquarium hobby.

Aquarium salt (sodium chloride) is a general-purpose salt usable to make water more alkaline and help with fish health. Meanwhile, Epsom salt (magnesium sulfate) is a type of mineral salt used to improve the hardness of freshwater for some fish.

In this blog post, we will take a closer look at the differences between aquarium salt and Epsom salt, discussing when it is appropriate to use each one.

What is Aquarium salt?

Aquarium salt is a type of salt formulated for use in aquariums. It is made from evaporated seawater and contains sodium chloride that is beneficial to fish and other aquatic creatures. Aquarium salt can be used to help maintain proper water chemistry, improve gill function, and reduce stress in fish.

It is also sometimes used as a treatment for sick or injured fish.

Aquarium owners add this sodium chloride salt to help with some different issues, including:

  • Reducing stress in fish
  • Reducing the spread of disease
  • Helping to remove toxins from the water
  • Increasing oxygen levels in the water

When using aquarium salt, make sure you follow the directions carefully. Too much salt can be harmful to fish, so it is important only to use the recommended amount. Aquarium salt can be added to the water either directly or using a filter system.

What is Epsom salt?

what is aquarium salt

Epsom salt is a mineral compound consisting of sulfate and magnesium. It’s often used in gardening and farming to help plants grow more vigorously.

Epsom salt is sometimes added to the water in the aquarium hobby to create a more natural environment for fish and other aquatic creatures.

Epsom salt is a naturally occurring mineral compound of magnesium sulfate. It has many uses, one of which is a stress-reliever for aquarium fish.

Aquarium fish are often stressed by the changes in their environment, such as when their tank is cleaned or new fish are added. The sulfates in Epsom salt can help to detoxify the water, making it healthier for your fish.

The magnesium in Epsom salt can also help to promote plant growth.

Aquarium salt vs Epsom salt: Which one should you use?

  • Price: Aquarium salt is cheaper
  • Composition: Aquarium salt is made up of sodium chloride, while Epsom salt is magnesium sulfate.
  • Side effects: If aquarium salt is used in too high of a concentration, it can be harmful to fish. Epsom salt can also be harmful if used in too high a concentration.
  • Effectiveness: Aquarium salt effectively raises the specific gravity and helps with the molting process in invertebrates. Epsom salt is effective as a laxative and to soothe sore muscles, but it is not as effective as a fertilizer for plants.
  • Cure parasites: Aquarium salt
  • Safe for use with aquarium plants: Epsom salt
  • Adjust pH level and hardness level of tank water: Epsom salt
  • Heals fish injuries: Aquarium salt
  • Help treat dropsy: Epsom salt
  • Help with the gill function: Aquarium salt
  • Decrease the absorption of nitrates: Aquarium salt


Epsom salt is a versatile product that can be used for many purposes, including as an aquarium salt. However, it is essential to remember that Epsom salt is not the same as regular aquarium salt and, therefore, cannot be used interchangeably.

Aquarium salt is specifically designed for use in freshwater aquariums, while Epsom salt can increase the hardness and adjust pH level, thus good for aquarium plants.

Aquarium salt is also generally more expensive than Epsom salt. While both products have their benefits, it is essential to choose the right one for your needs to get the most out of it.

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