Keep your pet's water fountain flowing clean and clear with these replacement foam pre-filters! This pack comes with 24 sponges, so you'll be stocked up for months. They're designed to fit most standard 67oz or 2-liter capacity pet water fountains (the common size for many popular models). Each sponge is about 1.34 x 1.18 x 0.63 inches. Their job is to trap larger debris like hair, dust, and food particles before they reach and clog the main pump. This helps maintain good water flow, protects the pump from damage, and keeps the water cleaner for your cat or dog. They're not reusable – once they're dirty, you just toss the old one and pop in a new one. It's recommended to change them every 2 to 4 weeks, depending on how much your pets use the fountain and how much hair they shed. Installation is a breeze: just rinse the new sponge under water to activate it, squeeze out the excess, and place it in the filter compartment. An affordable, essential maintenance item for any pet fountain owner to ensure fresh, filtered water for their furry friends.