【Perfect Match】ONLY Compatible with 95oz and 67oz Veken Pet Fountain. (Filter size: 3.9 x 3.9 x 0.4in)【Premium 4 Pack】 Package includes 4-pack of premium pet fountain replacement filters.maintain high quality.【Keep Your Pet Healthy】Each filter is composed of activated carbon, ion exchange resin and non-woven fabric. They can filter hair, heavy metals, and improve the taste of the water so that pets can drink clean and fresh water all day, which helps to increase water consumption and reduce the risk of urinary tract infections. Also, adding a pre-filter sponge around the pump to better filter impurities and extend pump life.^【Recommendations】To prevent the activated carbon dust (which will not harm your pets) from shedding into the water, please soak the filter in water for 2 minutes and rinse it thoroughly under running water before use.【Replace The Filter Regularly】 According to your pet's drinking frequency and the number of pets using the fountain, please replace the filter and the sponge every 2 to 3 weeks.