[Perfect Match] Thiscat water fountain filter replacement Blue-White Upgraded is compatible with our 61 OZ / 1.8 L HAPUP dog cat fountain kitty spout animal water fountain. Encourages your cats, kitty and dogs to drink more, helping them replenish moisture and keep healthy. [Quadruple Filtration System] Pet water fountain filters are composed of a separate pre-filter sponge and a triple filtration food grade cat fountain filter. Besides the pre-filter sponge to pretect the pump and filter impurities, PP cotton catch cats hair and debris, the ion exchange resin layer soften the tap water, the carbon layer remove bad taste. The cat fountain filter can effectively maintain water quality by the multiple filtrations to provide healthy and hygienic water to pets. [New Upgraded More Sufficient Materials]The cat water fountain filters are made of food grade, more safer, sufficient material, and each separate piece is tightly sealed inside with the sturdy superior PP cotton layer, won't penetrate through the pp cotton, no carbon particles evident in water! Natural larger particulate coconut shell activated carbon and ion exchange resin are filled more sufficiently than the old, which achieve stronger purification performance and extend the use time. [Period How to Use]To prevent the activated carbon dust ( which will not harm your pets) from shedding into water, please soak thecat fountain filters in normal temperature water for 2 minutes and rinse it thoroughly under under running water before use. It's strongly recommended to replace the filter every 2-6 weeks to ensure a clean water source! Flush the filter with water every time you change the water. Install tips: please keep the convex surface downward, and the flat side upward.