About this item [4Gal/15L Extra-Large Capacity]: Say goodbye to frequent refills! With a massive 4-gallon (15L) water tank, this fountain is perfect for multi-pet families and medium-to-large dogs or cats. Even when you're away, your pets always have access to fresh water, providing long-lasting hydration. [Advanced Filtration System]: Our stainless steel bowl features a built-in 5-layer filtration system that removes hair, impurities, and residual chlorine while reducing scale. Enjoy fresh, purified water with no unpleasant odor. [Ultra-Quiet Operation]: The innovative pump design and low-decibel motor keep noise below 25dB, ensuring a peaceful environment for both pets and family. [Smart Water Level Indicator]: Equipped with an integrated optical sensor, the water level window shows blue light when full and red light when water is low, making monitoring effortless. [Premium Stainless Steel]: Crafted entirely from stainless steel, this fountain eliminates scratching, odor retention, and chemical leaching common in plastic bowls. The smooth surface is easy to clean with a quick rinse, ensuring your pet's drinking health.