Mineral water rinse clears my scalp psoriasis

I wanted to share my 'cure' for scalp psoriasis so that other sufferers might see if it works for them. I buy supermarket mineral water and use it as a final rinse after washing my hair (a jug full is enough but long hair might need more). I am careful to use gentle and natural shampoos and conditioners as well. I've tried a cold water rinse with tap water but the psoriasis always comes back. However, as soon as I go back to the bottled water rinse it clears the psoriasis almost immediately. So I wonder if it is the chlorine in tap water that causes the condition. By the way you do get used to the cold water! I would be interested to hear if this works for anyone else.