Last Updated on February 4, 2020 by Cooper Fulton

Will Pond Salt Help With Algae?

I believe pond salt is something every pond owner should always have on hand. So, will pond salt help with algae? Yes, and it works wonders. Will Pond Salt Help With Algae?

Pond salt works great in koi and goldfish ponds, as it improves their natural defenses.

Pond salt is also safe for the plants and fish you have, as long as it is in safe amounts.

Do not worry about killing your fish or plants as both have a higher tolerance than you think when it comes to salt.

If you don’t go overboard on the salt, everything will stay alive in your pond.

It’s recommended to use pond salt before using any other medicine on your pond. Pond salt has so many benefits:

Pond salt helps to eliminate 10 of the most commonly found parasites in your pond.

It also helps remove any algae growth in your pond.

Pons salt very cheap works extremely well and doesn’t corrode your filter or any other equipment in your pond.,

It is safe to use with any liner and does not eat any holes in any form of plastic.


How Does Pond Salt Work?


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Plants and fish use osmosis to absorb outside levels and balance out the levels of salt, oxygen, and many other things.

During osmosis, the high concentration will flow to the lower concentration.

Let’s use salt for example if you add salt to your pond water, the plants and fish that have little salt will start to absorb the salt in the water.

This will continue until the levels of the salt are balanced inside and outside of the plant or fish.

So, when adding in safe amounts of salt to your pond, all the living organisms in the pond will have the same percentage of salt in them as the outside water.

Safe amounts of salt are .1 to .25 percent salt. Algae are very sensitive to salt and will die very quickly.

The fish and most other aquatic plants have a higher tolerance and will not be harmed by the pond salt that is used in the right proportions. 


Pond Salt vs Table Salt

Pond salt and table salt are really not much different but that doesn’t mean you can go and use regular store-bought table salt and put it in your pond.

The use of table salt will result in the death of your fish and will provide little to no help when it comes to removing algae.

Here is why; Regular store-bought salt is sodium chloride, with a few extra preservatives.

Table salt also contains iodine, potassium, and an agent to prevent the salt from sticking together in humid climates.

This agent is the main difference between table salt and pond salt.


Can I Use Marine Salt In Pond?

Marine salt, what is it? This is the salt that is used in saltwater aquariums to keep the saltwater level at a safe place.

If it is safe for fish then I can use it in the pond?

No, this is a completely different type of salt and is only safe for the use of saltwater aquariums and saltwater fish. The only safe salt for a freshwater pond is pond salt.

Using pond salt is safe for all freshwater fish will kill bacteria, parasites, and will keep your pond clear of algae.


How Much Pond Salt To Use?

I recommend you use 1-2 pounds (2-4 cups) of pond salt per every 100 pounds of water in your pond. You can use this as well to know how much salt to use – Pond Salt Calculator.

Salt is crucial to help your fish be as healthy as possible.

Pond salt creates a layer of slime on the fish which gives it more energy to build its immune system, this helps fight off bacterial infections.

The pond salt will kill algae which will make your pond clear throughout the year. 


Benefits of Pond Salt For Fish

Benefits of Pond Salt For Fish


The best salt that I have used is the Crystal Clear Pond Salt. This salt not only removes algae but it also strengthens my fish.

Yes, by adding in the right amount of salt will help to create a thin layer of slime on the fish in your pond.

This slime layer will protect the fish from any parasite which keeps the fish healthy.

The salt will not only help create a slime coat but will kill any harmful bacteria or parasites that might be living on one of your fish.

Parasites can be very dangerous in a pond as they can quickly spread throughout all the fish in your pond.

If the fish go untreated most parasites can lead to sickness of your fish which leads to the death of your fish.

The slime coat also helps boost their immune system which will prevent them from getting sick due to bacteria in the water.

The presence of salt in the water will help heal the scales of your fish and any other wounds they have.

Salt has the same effect on humans as it does with fish, it helps to heal any scabs or wounds that we have.

Fish are just more sensitive to the levels of salt as they take in the salt through osmosis, which means the salt will be flowing through their whole body whether they want it or not.

When adding in any amount of salt to a pond, you have to be very careful as all outdoor ponds are freshwater and a lot of salt can hurt the fish living inside the pond. 

If too much salt is added to the pond it can lead to the death of all your fish almost instantly.

This is because the salt will be taken in by the fish and if the levels are too high will shut down the kidneys, meaning the fish will no longer be able to filter out the excess salt and kill it.


Is Pond Salt Safe for Plants?

Is Pond Salt Safe for Plants?

If you are using good pond salt, with no added chemicals or preservatives, it will be safe with the use of pond plants. 

Plants can either be sensitive to salt or have a high tolerance and never be affected by the newly added salt. 

By making sure the level of salt in your pond never reaches more than .25 percent most aquatic plants will have no problem with the risen percentage of salt. 

After you have added in the salt, start watching your plants to make sure they do not start to look droopy or develop dead spots on the leaves.

 If you do notice this, take them out and put them in a small bucket. Leave the plant in the bucket with water until the salt levels have dropped and then you can add it back into the pond.


How To Use Pond Salt

A pond requires upkeep and maintenance so the living fish are happy and healthy.

That’s why applying the right amount of pond salt is so important, as well as using it correctly.

As I mentioned above, remember to use 2-4 cups of pond salt, then pepper in the salt around the edges of your pond.

After the salt has been there for 1 hour, take out your salinity checker, if it reads the salt content is greater than .2 percent you should partially change the water.

A precaution to keeping your plants safe is to sprinkle the salt around where the plants are to make sure the salt does not come in complete contact with the plant. 


How To Test How Much Salt Is In Pond

If you decide to purchase some pond salt, knowing how much salt is in your pond is always a good idea.

Like I mentioned above, too much pond salt can kill your fish and surrounding plants.

Just in case you think you put too much you’ll know, with a salinity checker.

I’ve been using pond salt for quite some time and it is the best algae killer.

Also, from my experience pond salt has helped my fish live to 5-10 years longer than expected.



So, pond salt, you should at least give it a try.

When I first began building ponds, I was a little skeptical about using it because I felt my fish would just die, since they are freshwater.

Although after a ton of research and knowing all these benefits made me try it and I never looked back.

It got rid of all my algae and strengthened my fish, it was amazing.