REVER Filter Elements for Pet Water Fountains Replacement kit: Pack of 4 Filters + 9 Sponges Activated Carbon Filtration

[Important Notice]: This filter cartridge is compatible with REVER pet water fountains (specifically 1st-generation models suitable for cats, dogs, and small animals). If you own the 1st-generation E101 fountain model and wish to use this filter, please verify its compatibility with your device. [Enhanced Filtration Performance]: REVER filter cartridges are made using high-precision filtration materials. Thanks to the increased density and volume of the filtration materials inside the cartridge, they deliver superior filtration results. This design effectively removes pet hair, impurities, heavy metals, and other harmful substances from the water, helping to protect your beloved pets from waterborne diseases. [Instructions for Use]: Before replacing the filter cartridge, soak it in cold water for approximately 5 minutes to fully activate the internal ion-exchange resins. [Quadruple Filtration System]: The filtration structure consists of four layers: a double layer of high-quality cotton mesh, coconut shell activated carbon, and ion-exchange resins. High-density microporous filtration materials effectively capture fine particles and floating pet hair, while ion-exchange resins soften the water by removing calcium and magnesium ions—the primary causes of urinary stone formation in pets. [Filter Replacement Cycle]: Generally, if the device frequently remains in standby mode or is used for short periods, we recommend replacing the filter cartridge every 3 months. If the device operates continuously for extended periods, we recommend replacing the filter every month.