The Omnipure E5655 is a Deionization water filter. This filter also features a universal cap that fits all permanent existing heads which makes this filter easy to install and remove. This filter also aids in the removal of dissolved salts and ionized minerals in water. Additional Details ------------------------------ Product description: The Omnipure E5655 is a Deionization water filter. This filter also features a universal cap that fits all permanent existing heads which makes this filter easy to install and remove. This filter also aids in the removal of dissolved salts and ionized minerals in water.