Perfect Match: 4-pack dog water fountain filters compatible with PETNF D2322 3-gallon stainless steel large dog water fountain for large dogs. Also compatible with large dog water fountains for D2223 and D2341 models. Please note that it only includes 4 replacement filters; the stainless steel dog water fountain must be purchased separately Keep Your Pet Healthy: Our PETNF stainless steel dog water fountain ensures your furry friend has access to clean, fresh water all day long. Our advanced 7-layer filtration system, featuring high-density activated carbon and ion exchange resin filters, effectively removes hair and heavy metals from the water while maintaining its purity and enhancing oxygen content 7-Layer Vertical Filtration: Unlike the flat filters commonly found in the market, our 7-layer vertical filtration system achieves genuine multi-layered filtering, ensuring a constant supply of fresh, clean water for your beloved pets. The water, filtered layer by layer, tastes better and encourages pets to drink more, promoting overall health User-Friendly: Simply soak the filter in water for 2 minutes and rinse it thoroughly under running water before assembly. Then, place it in the PETNF 3 gallons stainless steel pet water fountain for optimal use. We suggest changing the filters every 2 weeks to maintain fresh water, contributing to the overall well-being of your beloved pets PETNF Dog Water Fountain Filters Replacement 4 Pack, 2 Months Set of Replacement Filters for PETNF 11.4L/3 Gallons Stainless Steel Large Dog Water Fountain for Large Dogs, 7 Layer Vertical Filtration Pet Water Fountain Filter for D2223, D2341, D2322, D2340 Models, Lasts Two Months, More Clean and Fresh Water for Your Pets