1.Important:Cat water fountain filters replacement perfectly compatible with E VERSWEET 2S, E VERSWEET 3/3Pro, SOLO PURE DRINK pet water fountain. 2.Quadruple Filtration System:The pet fountain filter has a four-layer filtration system: a high-density cotton non-woven fabric layer filters hair and food; activated carbon particles remove chlorine and odors; ion exchange resin filters heavy metals and improves taste; and an ABS grid prevents hair and large particles from entering, keeping the water clean, healthy, and tasty. 3.Replacement Frequency:It is recommended to replace the filter every 2 weeks in summer and every 4 weeks in winter. If multiple cats are using the same fountain, more frequent replacement may be necessary. After replacing the filter, do not forget to reset the device (the actual replacement time depends on the filter status, and the filter indicator light flash when a replacement is needed). 4.Replacement Method:To prevent activated carbon dust from shedding into the water, soak the cat fountain filter in water for 10 minutes and rinse thoroughly under running water before using. Item model number: Filter Product Benefits: Removes impurities and improves water quality Colour:White Material:ABS Package Contents: 10 x Water Fountain Filters 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.