Wide Compatibility: Compatible with most 84oz/2.5L Square pet fountain on market. Diameter of hollow circle is about 1.4 inch.Length of square is about 4.8 inch.Not compatible with 95oz/2.8L pet fountain. | Value Filter Set: Pack of 8 filter ,1 cleaning brush. Filter and Sponges are individually sealed. | Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. | Keeping Health: Helps pet to increase water consumption. | Note: Please rinse filter before use. Replace filter every 2-4 weeks.

Wide Compatibility: Compatible with most 84oz/2.5L Square pet fountain on market.Diameter of hollow circle is about 1.4 inch.Length of square is about 4.8 inch. | Value Filter Set: Pack of 16 filters, Filters are individually sealed. | Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. | Keeping Health: Helps pet to increase water consumption and reduce the risk of urinary tract infections. | Note: Please rinse filter before use. Replace filter every 2-4 weeks.

Wide Compatibility: Compatible with most 81oz/2.4L round pet fountain on market. Diameter of hollow circle is about 1.4 inch.Diameter of outer circle is about 5 inch. | Value Filter Set: Pack of 12 filters,Filters are individually sealed. | Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. | Keeping Health: Helps pet to increase water consumption. | Note: Please rinse filter before use. Replace filter every 2-4 weeks.

Wide Compatibility: Compatible with most 81oz/2.4L round pet fountain on market. Diameter of hollow circle is about 1.4 inch.Diameter of outer circle is about 5 inch. | Value Filter Set: Pack of 16 filters,Filters are individually sealed. | Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. | Keeping Health: Helps pet to increase water consumption and reduce the risk of urinary tract infections. | Note: Please rinse filter before use. Replace filter every 2-4 weeks.

Wide Compatibility: Compatible with most 81oz/2.4L round pet fountain on market. Diameter of hollow circle is about 1.4 inch.Diameter of outer circle is about 5 inch.(Not for catit fountain). | Value Filter Set: Pack of 8 filters, pack of 4 pre-filter sponges, Filter and Sponges are individually sealed. | Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. | Keeping Health: Helps pet to increase water consumption. | Note: Please rinse filter before use. Replace filter every 2-4 weeks.