Keep Your 71oz/2.1L Capsule Fountain Running Smoothly Regular filter replacement is essential for maintaining your pet fountain's performance and water quality. Over time, hair, food particles, and mineral buildup can clog your filter, reduce water flow, and create unpleasant tastes that make your pet avoid the fountain. Complete Filtration Solution Each replacement filter features a triple-layer design that works together to keep water clean and fresh. The non-woven fabric layer captures hair and large debris. Activated carbon helps reduce chlorine and unpleasant odors. Ion exchange resin helps reduce limescale and mineral content commonly found in tap water. Precision Fit for Capsule Fountains Designed specifically for 71oz/2.1L capsule-style pet fountains, these filters fit securely in place without gaps or water bypass. The exact dimensions ensure proper water flow through all filtration layers, not around them. Pump Protection Included Each kit comes with pre-filter sponges that trap larger particles before they reach the pump. This extra layer of protection helps prevent pump clogging that can cause noise and reduce motor lifespan. Rinse sponges weekly and replace with each filter change. Easy Maintenance Soak the filter in clean water for 2 minutes and rinse thoroughly before first use. Replace every 2-4 weeks depending on the number of pets and local water conditions. For best results, rinse the pre-filter sponge weekly during regular fountain cleaning. What You Receive 8 replacement filters + 8 pre-filter sponges — enough supplies for approximately 4 months of use for single-pet households.