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7 Best Dechlorinators For Aquariums in 2022 – Reviews & Top Picks

Lindsey Stanton Profile Picture

By Lindsey Stanton

red-fighting-fish-for-test-waterWe all know that there are various chemicals and compounds which are beneficial to have in your aquarium. That being said there are far more things which should not be present in your aquarium due to fears of toxicity and the death of your fish. One of the worst things to have in your aquarium is chlorine. Simply put, chlorine will kill your fish, bottom line.

The problem is that most people use tap water to fill their aquariums, which of course is loaded with chlorine. For this reason, you need to find a water conditioner or dechlorinating agent to treat your water in order to make it suitable for aquarium use. Let’s go over the basics of chlorine and what some of the top contenders are for the best dechlorinator for your aquarium. (This is our top pick).

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A Quick Comparison of our Favorites of 2022

Rating Image Product Details
Seachem Prime Seachem Prime
  • Permanently removes chlorine
  • Complete and concentrated conditioner
  • Detoxifies ammonia
  • nitrite
  • and heavy metals
  • Second place
    Tetra AquaSafe PLUS Water Treatment Tetra AquaSafe PLUS Water Treatment
  • For fresh & saltwater
  • With natural biopolymers
  • Enhances protective slime coat
  • Third place
    Natural Rapport Water Conditioner Natural Rapport Water Conditioner
  • Neutralizes chlorine
  • nitrites
  • & ammonia
  • Makes your tap water instantly safe
  • Quick to remove harmful bacteria
  • Why Do I Need To Use A Dechlorinator/Water Conditioner?

    Simply put, a dechlorinating agent will neutralize and remove chlorine from water. Even trace amounts of chlorine can be lethal to fish, so you definitely need to remove it before adding water into your aquarium. If you use tap water to fill up your aquarium, you need to do this without fail.

    Any chlorine in the water can have disastrous consequences for all of the life inside of the fish tank. Chlorine will kill your fish, so be very vigilant when it comes to adding tap water to your aquarium.

    The 7 Best Dechlorinators for Aquariums

    1. Seachem Prime – Best Overall

    Seachem Prime Fresh and Saltwater Conditioner

    Check Price on Chewy

    Seachem Prime is without a doubt one of the best dechlorinating options that you can go with. The beauty about this stuff is that it does not take a very large dose in order for it to be effective, thus making it quite friendly for your wallet. Seachem Prime not only dechlorinates water, but it also neutralizes various heavy metals in the water as well. Both chlorine and heavy metals are toxic to fish, so this is a big bonus indeed.

    Seachem Prime can help to eliminate toxic ammonia and nitrates, both things which are also toxic to fish. On a related note, this stuff will not cause your protein skimmer to go into overdrive, plus it also helps to promote a healthy and natural slime coat on your fish.

    2. Tetra AquaSafe PLUS Water Treatment

    Tetra AquaSafe Plus Water ConditionerTetra AquaSafe Plus Water Conditioner

    A good alternative to our number one choice, Tetra AquaSafe PLUS Water Treatment neutralizes chlorine and chloramines in the water in a mere matter of seconds. One single teaspoon of this stuff can treat a full 100 gallons of water, thus making it fairly cost effective. This stuff can be used with both freshwater fish and saltwater fish, which is pretty great if you ask us.

    Another good part about Tetra AquaSafe Plus Water Treatment is that it also neutralizes heavy metals in the water. Moreover, the fact that it promotes a good natural slime coat is also very beneficial for your fish. Also pretty neat is the fact that this stuff helps to increase the amount of beneficial bacteria in the water, which help to engage in biological filtration.

    3. API TAP WATER CONDITIONER Aquarium Water Conditioner

    API TAP Water Conditioner

    This is another good dechlorinating option that works just fine. This is a super strength high concentration formula, which means that you only need to use a teeny bit in order for it to be effective. API TAP WATER CONDITIONER Aquarium Water Conditioner is fantastic for removing various elements in tap water which can cause tissue and gill irritation, respiratory afflictions, and death.

    It will remove chlorine, chloramines, and various other chemicals too. It will get rid of heavy metals in the water as well. One bottle of API TAP WATER CONDITIONER Aquarium Water Conditioner is enough to treat 600 gallons of water and is safe for both fresh and saltwater fish.

    4. Natural Rapport Water Conditioner

    Natural Rapport Aquarium Water Conditioner

    This is another crowd favorite water Dechlorinator to go with. Many people love this option because it serves several purposes at once. First off, it has the ability to neutralize and eliminate various elements in the water such as chlorine, chloramines, nitrites, ammonia, and heavy metals too. What is neat about Natural Rapport Water Conditioner is that it adds electrolytes into the water which increase the health of your fish.

    At the same time, this conditioner helps to spur on the healthy and quick production of a natural slime coat on your fish. This particular conditioner can be used for both saltwater and freshwater, plus it is said to help reduce stress too.

    5. HOME GROWN PONICS Instant D-Klor

    HOME GROWN PONICS Instant Natural Dechlorinator

    One of the things that we love so much about Home Grown Ponics Instant D-Klor is that it contains absolutely no chemicals. With this stuff you can rest assured that you are getting rid of chlorine and chloramines in the water without introducing any other unwanted chemicals or compounds into the water. It’s a really neat option to go with because it will not harm biological filters in any way.

    It is safe for both salt and freshwater, it’s safe for invertebrates, and it works great for hydroponics operations too. Home Grown Ponics Instant D-Klor also adds lots of vitamin C to the water for the health of your fish, plus it promotes the natural growth of their slime coat too.

    6. ATM Blue Shark All Natural Dechlorinator

    ATM Aquarium Products Paradigm

    This final option is another solid choice to go with. You will like this option thanks to the fact that it is all natural and does not contain any unwanted chemicals. It is made with the chlorine killing properties of Aloe Vera, something which is also very useful for promoting the natural production of slime coats on fish.

    The fact this stuff also uses the natural properties of Vitamin C to get rid of chlorine is another thing that we really like about it. ATM Blue Shark All Natural Dechlorinator gets rid of chlorine, is natural, and is actually beneficial for your fish in more ways than one.

    7. Kordon NovAqua+

    Kordon Novaqua Plus Water Conditioner

    When it comes to the best fish tank dechlorinator out there, we think that the Kordon NovAqua+ is one of the best possible options out there at this time. This is one of the items that is not particularly fancy. Yes, it does do more than just dechlorinate water, but they are all things which are beneficial for your fish tank.

    Besides dechlorinating water, Kordon NovAqua+ has some other neat benefits too. One of these benefits is that it helps to add more skin slime to your fish for added protection.

    Next, it can be used for both freshwater and saltwater aquarium setups, which is always a big help if you ask us. Moreover, the Kordon NovAqua+ dechlorinator also removes all kinds of dangerous heavy metals from the water, something else which we definitely see as a big added bonus. Furthermore, this stuff also contains some immunizing agents and vitamins which can greatly benefit all of the fish in your aquarium.

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    Buyers Guide: What Is Chlorine?

    You probably know that we humans use chlorine in pools and in drinking water to a certain degree. When you go swimming, it’s that stuff that burns your eyes and makes them all red and itchy after you are done swimming. Chlorine is a naturally occurring element that humans often use as a water disinfectant. In small doses it does a great job at killing off various bacteria, viruses, and parasites in the water.

    Generally speaking, in smaller doses, chlorine is not harmful to humans, but of course you can’t swallow huge amounts of pure chlorine without paying the price. That being said, chlorine is very toxic to fish, so it’s not something that you want to have in your aquarium. It will kill your fish without question. As you can tell, chlorine is usually beneficial for humans, but not so much for the fish and plants in your aquarium.

    How To Dechlorinate Water For Fish Tanks

    The first thing to remember here is that each dechlorinator is a little different, especially when it comes to various brand names. Therefore, the first thing to do is to read the label on the specific dechlorinator you got for dosing instructions.

    Getting the dose right is extremely important, because using too little will not get rid of all of the chlorine in the water, while too much can have some bad side effects too.

    However, generally speaking, most dechlorinator variations will use anywhere from 1 to 2 drops of the dechlorinator liquid for every 1 to 2 gallons of water. Never treat the entire volume of the existing water in the tank unless you are filling the aquarium for the very first time.

    You just need to dechlorinate new tap water, not the water already in the tank. Always read the instructions first, but it should take no more than 5 minutes for all of the chlorine to be neutralized and removed.

    Are There Any Side Effects From Using Aquarium Dechlorinator?

    Usually, most dechlorinators that are purely meant for dechlorination will not adversely affect the chemistry or make-up of the water. However, there are many dechlorinators out there which do extra stuff and have more than one purpose. These can indeed have some side effects that you do not want.

    With dechlorinators that do more than just dechlorination, when it comes to small tanks, they are particular susceptible to the buildup of various dangerous chemicals and elements. You definitely want to keep an eye on the fancy dechlorinators that claim to do more than just dechlorination as they can have some nasty side effects. However, your basic dechlorinator for fish liquids should not come with any unwanted side effects.

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    Remember folks, chlorine is horrible for your fish no matter what. Under no circumstances can you fill your aquarium with untreated tap water. You need a good dechlorinating agent or water conditioner to get rid of that toxic chlorine (Seachem Prime is our top pick). Keep your fish safe by using the best Dechlorinator for your aquarium. The 6 above conditioners all make for good choices in our opinion.

    Featured Image Credit: Pic ture, Shutterstock

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