This is a water softening filter for dogs. It supports your pet's health. - Contents: 3 pieces - Filter type: Water softening filter - Country of manufacture: Thailand - Applicable water: Soft water Thank you for viewing. I've used one. There are 3 remaining. Please check if the model number matches your water dispenser. Please purchase if you understand that this is a stored item. The box will be flattened for shipping to save on shipping costs.