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. Not compatible with 95oz/2.8L pet fountain. | 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 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.

Value Filter Set: Pack of 8 Pre-Filter Sponges.Size:1.3inch x1.3inch x 2.1inch. | High Density: Helps to filter hair and prevent food residues from entering the pump. | Premium Filtration System: Effectively to filter hair, heavy metals. keeping your pet's water clean and fresh. | 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.Not compatible with 95oz/2.8L pet fountain. | Value Filter Set: Pack of 10 filters,1 cleaning brush. 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.(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.

[Dual Function]: Can be used as a door stop alarm and door stopper, Its high damping rubber bearing can prevent the door sliding and prevent the bad guys into. | [3 Level of Sensitivities]: Hige-Midium- Low Sensitivities. Which depends on the distance door touch the door stop alarm. | [Loud Alarm]: Very loud shrill that would definitely scare someone away with 120db alarm. Weight: 4.5 oz. | [Powered by 9V Battery]: Powered by 9V battery, One piece can be used for a year under normal circumstances. (Note: Battery not include) | [Easy to Use]: NO installation required, Simply place the alarm behind any door (home, hotel, etc).