REFILL CARTRIDGES: This product includes refill cartridges for the Hello Klean Rain Shower. This is a capsule only, and does not come with any casing. HOW TO INSTALL: Remove your Rain Shower or Shower Filter from the tap. Open the casing and swap out the capsules. Reattach the Rain Shower or Shower Filter to your tap. Run the water for 30 seconds. SPECIALLY SELECTED INGREDIENTS: The Hello Klean Refill Capsule 2.0 contains three key ingredients which help to purify water. KDF 55 helps to reduce water soluble metals such as lead, iron, copper, mercury and nickel. Activated Carbon Fibre reduces contaminants and odour whilst the Ceramic Beads adjust the pH levels of your water to an optimal level and boost filtration. HOW OFTEN SHOULD YOU REPLACE: Each refill capsule will purify 13,000 litres of water. For a household of 1, this would typically last around 5 months. For a household of 2, this would typically last around 4 months.