High-performance pet water filter cartridges designed for automatic pet drinking fountains, featuring a dual-layer filtration system with activated coconut shell carbon, ion-exchange resin, and non-woven fabric for superior water purification. Each cartridge measures 11.5 cm in length and 3 cm in width, with blue cotton layer (11.5 cm × 3 cm) and white cotton layer (11.5 cm × 3 cm), housed in a compact white box (12.5 × 8.5 × 5 cm). The ergonomic arched shape ensures snug fit and optimal water flow in most standard pet fountain models. Ideal for cats and dogs, these filters effectively reduce chlorine, heavy metals, odors, and impurities while softening water hardness—promoting healthier hydration and reducing tartar buildup. Replace every 2–4 weeks depending on usage and pet size. Perfect for daily home use, especially in multi-pet households or for pets with sensitive stomachs. The clean blue-and-white aesthetic complements modern pet accessories without compromising functionality.