Terra-Tec H2O is demineralized water is perfect for use with humidifiers and rain systems. It can also be used for aquariums.
Normal water has the problem that the minerals contained in it can cause limescale deposits and can damage pumps and other units. Some regions have such hard water that a Super Fog membrane can be ruined within a few days. With Terra-Tec H2O you can prevent this problem achieving a long life and longer maintenance intervals for you humidifiers and other devices.
By the way: the claims that demineralised/distilled water is dangerous for humans and animals is wrong. In nature dew is an important water source for animals and it only contains very little minerals. It is simply false that demineralised water deprives the animals of nutrients.