Shower filter attaches to your electric shower base or shower head. Filter cartridge inculded. Remove blue plastic caps from both sides of cartridge inside filter cover before use. Twist open filter housing to access filter. Removes sentiments , chlorine and metals that cause hard water which discolour your hair and leave it rough and noughty. Also makes your skin feel soft and clean to the touch. Filters usually last upto 6 months if shower is used by 1 to 2 people , 3 months if family is using it. You can purchase replacement cartridges separately for only €30.00 . Easily installed no tools needed. 30 second install time