perfect compatibility for Dockstream Cat Water Fountains (PLWF105 or PLWF115 or PLWF005) - our filters are specifically designed for these models. Experience purification with our premium quality filters featuring a Triple Filtration System - a cotton layer, activated carbon, and an ion exchange resin. These components work effectively together to remove hair, filter out heavy metals, and improve the overall taste of the water, ensuring your pet enjoys , clean water every time. Frequency of replacement varies according to usage and weather conditions. In summer, expect to change the filter every 1 to 2 weeks, and every 2 to 4 weeks in winter. If multiple pets use the fountain, the filter might need to be replaced more frequently. To optimize the filter's performance, soak it in water for 5 minutes and rinse thoroughly under running water before use. Our package includes a generous supply of 8 premium pet fountain filters and 8 pre-filter sponges - enough for 3 to 8 months of use. To maintain water freshness, we recommend changing the pre-filter sponge every 2-4 weeks. Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:White Material:non-woven fabric Package Contents: 8 x Cat Water Fountain Filters 8 x filter sponge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.