How to Make Tap Water Safe for Fish without Chemicals

If you are setting up an aquarium at home, one thing you will need to consider is your water source for filling up the tank. Many people decide on using tap water, which is fine in most cases. However, it is important to remember that tap water does contain chemicals such as chloramines and chloride, and these can be very toxic to your fish. This is why it is vital for aquarium owners to take the time to ensure the water is clean and safe for their fish.

There are various ways in which you can make tap water safe for your fish. The first is to use specially made products designed to de-chlorinate the water and remove potentially harmful chemicals before you add the water to the fish tank.

You can also get some very effective water conditioners that will make the water safe and remove toxins that could otherwise cause harm to the fish. However, some people simply put tap water in without any sort of treatment. This can then lead to serious problems for the fish.

What can you do to make the water safe?

If your fish are struggling with the tap water that you have put into the tank, you will generally see a  number of common symptoms. This includes breathing very fast, gasping for breaths of air, and going very red around the gills. Remember, although we drink tap water the chlorine levels in drinking water are minute, which makes it safe for us to drink. For fish, on the other hand, these minute chlorine levels can prove deadly. Check out the video below regarding different fish diseases and its treatment:

Experts do recommend the use of special solutions and water conditioners to make the tap water for your fish perfectly safe. This provides added peace of mind, as it ensures that all chemicals that could be harmful to your fish are properly removed before they are exposed to the water. However, it is always worth knowing what you need to do in order to make tap water safe without the use of chemicals. Some people prefer not to use chemical solutions and products in the tap water that they are adding to the fish tank. Others simply want to know how to make tap water safe without chemicals just in case they need the information to hand in the future.

The process of making tap water safe for your fish tank without the use of chemicals is pretty simple. However, you should be aware that this is not a fool-proof solution to making the tap water safe. There are no guarantees of the chemicals being completely removed using this method, which is why many believe that using specialist water cleaning and conditioning solutions is the most effective option.

If you do want to make tap water safe for your fish tank without using chemicals, you can leave it to ‘sit’ for 24 to 48 hours. During this time, it needs to be aerated to help boost the chances of the chlorine and other contaminants being removed. You should, of course, not have fish in the water during that time, as the chemicals will still be present. You should also let only the best filter run through the water during the ‘sitting’ period. This will help to dissipate the chlorine from the water.

Another thing that you should be aware of is that while allowing the tap water to sit and aerate for 24-48 hours can encourage chlorine to evaporate, it does not do the same for chloramines. You, therefore, may still be taking a risk if you do not use a proper solution or conditioner to treat the tap water. Some people find that this method works perfectly well for them and the fish are happy as well as healthy. However, others prefer not to take any chances so they decide to run with the use of conditioners and chemical solutions to treat the water.

Some people believe that using spring water will enable them to provide safe water for the fish without the need to use chemicals and conditioners. However, it is important to bear in mind that spring water may not have the necessary minerals to deal with pH, and this could result in an unstable habitat for your fish.


If you do decide to let your tap water sit in order to allow the chlorine to evaporate, make sure that you leave it out for at least 24 hours. Make sure that you run the filter too and properly aerate the water during that time. You need to remember that chloramines are often used in tap water these days and these can prove toxic for fish. Unfortunately, while leaving the tap water to sit can get rid of chlorine the same cannot be said when it comes to chloramines. This is something that you need to consider when deciding whether or not to treat your water.