Condicionamento da água
Here's how to make the right aquarium water from tap water
Depending on the country and region where you live, your tap water can be unsuitable or contain harmful substances for your aquarium dwellers.
These substances may be present and here’s how you can solve the problem
In tap water, depending on quality and place, various substances are present which are not always useful in the aquarium. Some water types can also be unsuitable for your aquarium fish, plants and invertebrates.