This filter is designed for NICREW square fountain 2L. Size: 11cm from the outer circle and 2.5cm from the inner circle Pack of 4, each piece is individually wrapped to ensure cleanliness of the filter, easy to store and use It is recommended to replace them regularly every 2-4 weeks to ensure the cleanest water source for your animals Activated carbon and exchange resin can effectively remove bad tastes and odors from drinking water Before use, please rinse the flat face of the filter upwards to wet the filter and clean the dust
