Hard Water and scalp psoriasis
Hard water is a term used to describe water that contains a high amount of minerals, such as calcium and magnesium. In home water systems without water softeners, hard water causes the chalky-white build-up called lime, around faucets, drains, and walls. Hard water is fairly harmless to drink and use, but poses a threat to the infrastructure of the water system of a building. The residue in hard water can however be irritating to the skin of some people, and some studies suggest that there is a correlation between hard water usage and an increase in eczema in children.
There are no studies available that provide evidence that hard water can cause psoriasis. However, using hard water to bathe with may contribute to irritation of the skin, and therefore further worsening the condition of psoriasis. It is best to set up a water softening system within the home, to reduce the effects of the minerals contained in the water.