The past tense of Demineralize is demineralized.
verb. remove the minerals or salts from.
1. Verb, non-3rd person singular present “It breaks down into acids that demineralize the tooth surface, also increasing the risk for developing cavities,” says Dr. Abayon. 2. Verb, base form Humidifiers that do not utilize a filter often have a cartridge that is used to demineralize the water and/or an antibacterial stick to help remove bacterial and minerals from the water.