The fragrance-free vitamin C cartridge for Aroma Sense and Aromica showers is a suitable choice for allergy sufferers who want the other positive benefits of the cartridge for dry skin. The vitamin C cartridge releases vitamin C into the water passing through the shower. Vitamin C removes the drying effect of chlorine from tap water and helps with skin dryness, flaking, atopy or psoriasis. This cartridge contains only food-grade vitamin C. Depending on water consumption, the cartridge will last for about 2 months for a family of 4.