A fish bowl including distilled water for fish tanks on blue background.

Is it Safe to Use Distilled Water for Fish Tanks?

An aquarium provides hours of fun and relaxation, and health benefits too. Studies show that people who spend a minimum of ten minutes watching fish in tanks exhibit lower blood pressure and heart rate and an improved overall mood. But have you ever wondered about the health and well-being of the fish in the tank? An aquarium should be a place where your fish can feel comfortable and thrive. To create an optimal environment for your fish to live in, you’ll need to use the right kind of water. But can you use distilled water for fish tanks?

The best water to use in an aquarium should be clean and contain as few contaminants as possible, right? Using distilled water for fish tanks seems like a good choice because it’s so pure but is it safe for aquatic life? In this guide, we’ll discuss if using distilled water for fish tanks is safe and when to use it in as your aquarium water for the well-being of your fish.

Try using vapor distilled water to supplement your fish tanks and keep your fish safer from toxic heavy metals like lead and mercury.

What is distilled water?

Water processed to remove impurities through a heating and cooling process is known as distilled water. Distillation requires the water first to be boiled. Steam is then produced, cooled, and collected, resulting in purified distilled water. This process mimics the natural events of evaporation, condensation, and precipitation.

How suitable is distilled water for fish tanks?

Using distilled water for fish tanks is justified under the following circumstances:

For changing the water in fish tanks, you should not use distilled water alone. You can use pure distilled water to top off an aquarium that has lost water due to evaporation. Having a Total Dissolved Solids (TDS) level of 0 makes this the softest possible water. Distilled water can be used to reduce the hardness of tap water used in a fish tank. As it contains no minerals, using distilled water alone makes it harmful to aquatic life. Although minerals are necessary for fish and plants, distilled water is one of the best options for keeping aquariums healthy.

Distilled water for fish tanks

When and how do you use distilled water for fish tanks?

Considering all the different types of water available for fish tanks, how can you determine whether you should use distilled water for fish tanks or something else instead? The use of distilled water eliminates the need to worry about introducing undesirable nutrients or other metals/chemicals into the aquarium that can harm the fish. Conversely, distilled water is stripped of most of the minerals required by many fish, plants, and invertebrates for certain cell processes, and the water will probably need to be re-supplied with these minerals.

In order to decrease the amount of TDS introduced into the tank while still maintaining a baseline reading, distilled water is often mixed with tap water or spring water by freshwater hobbyists. With this combination of distilled water and tap water, freshwater fish tanks can either be topped off for evaporation or changed entirely. Pure distilled water is a good option for topping off your fish tank because it won’t affect the mineral balance. The water that evaporated did not carry minerals with it. They remain in your aquarium, where they belong. 

Ready to give your fish the perfect habitat?

If you’re looking to invest in a really pure form of water for your fish tank, distilled water is the way to go. It’s the purest form of water out there, and it will help reduce the TDS levels in your tank, making sure that your fishes have everything they need to live a long and happy life. Just be sure to mix it with some tap or spring water so that you can balance out the minerals and make it suitable for your fish tank. If you want to keep your fish healthy and thriving, invest in vapor distilled water from Aquapap.

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