Brand new, unused. Just drop it in the bottle! With 4 types of balls, it supports lower urinary tract health! "Bottle in PON" suppresses the growth of bacteria and maintains clean water. Just drop it into the water bottle of your pet's water dispenser! ● Soft water balls reduce magnesium and calcium in tap water, making it soft water. ● Two types of antibacterial balls suppress the growth of bacteria and keep the water clean. ● Activated alumina adsorbs minerals, making the water gentle for pets. ● Safe structure that does not block the bottle's opening. ● Floats in the bottle and makes the water delicious! ● Usable bottle size: Inner diameter: Φ21.5mm or more, Height: 12cm or more