I ended up buying too many, so Would anyone like to buy them? The following is a quote: Replacement filter for Pure Crystal, softening filter soft. For maintaining the health of the lower urinary tract! Replace frequently, always clean!! This is a soft-type filter that should be replaced every 2-3 weeks for those who want to replace it frequently. The tray has been changed to non-woven fabric, reducing the amount of plastic used. ● Ionic (ion exchange resin): Removes magnesium and calcium from tap water to create soft water that is gentle on pets. ● Activated carbon (antibacterial activated carbon): Absorbs chlorine odor and makes the water delicious. ● Non-woven fabric: Soft fibers that catch food scraps, loose hair, and dust and keep them from escaping! ● Embossing: The unevenness of the tray allows water to spread throughout and effectively exert its effect! Magnesium and calcium are important minerals for animals, but by preventing excessive intake, you can take care of the health of the lower urinary tract. It is also important to drink plenty of water and increase the frequency of urination. You also need to pay attention to your diet, obesity, and lack of exercise on a daily basis. If you notice anything unusual, consult a veterinarian immediately. This product is not intended for the treatment of diseases. * Please use the genuine Pure Crystal replacement filter for the filter-type water dispenser Pure Crystal. If you use anything other than the genuine product, the filtration capacity may not be fully realized. Contents: 8 pieces Compatible models: Pure Crystal Well 1.5L/2.5L, Pure Crystal 1.5L/2.5L, Grassy R, Grassy, Nyaro *Please purchase with the understanding that these have been stored at home.