隔日的水喉水 >> Many people used this method for adding water in fish task / watering non Carnivorous Plant. However the tape water in fact contains lots of impurity as well as many metal / non metal ions.
For I was using humidifier fulfilled with tape water, after some months later, the tank of the humidifier is coating with very ugly brown impurity....Ku Ku Ku...
For Carnivorous Plant such as Venus Fly trap and Drosera, it is highly recommended NOT to use tape water.