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How Much Salt Is Needed for a Fish Pond?

| Updated September 26, 2017

When you think your pond is ready for fish, it’s important to make sure you’ve got everything right to keep them healthy. One important step in fish pond keeping is how much salt to add. Fish often thrive in ponds with small amounts of salt added to the water.

Fish Health Benefits

Pond salt raises electrolyte levels that your fish require. It also helps to cut down on bacteria in the pond, creating a safer environment. Pond salt also allows your fish to grow thicker slime coats, which help to block parasites and bacteria.

Pond Salt Risks

Many pond plants don’t thrive well in a salty environment. If you have many plants in your pond, use lower salt levels and avoid sprinkling salt directly on the plants.


Generally, the rule of thumb for adding pond salt to your pond is to use 2 ½ cups per 100 gallons of water. Use only 1 ½ cups for heavily planted ponds. You can sprinkle this salt around the edges of the pond or dissolve it in water first, then pour it into the pond. Only add salt when you do a water change, and always test your water to make sure the nutrient and salt levels are balanced.