This product is made to improve the oral environment of pet dogs. When the KENKO CARE Multiple Ions Releasing Plate is put into drinking water, six types of ions (Sodium Ion, Borate Ion, Aluminum Ion, Silicate Ion, Fluoride Ion, and Strontium Ion) are released from the PRG filler into the water. The ions without interfering each other help to maintain your pet dog’s oral health by drinking the water. The ion effect also helps prevent slime forms in your pet dog’s water dish.