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【Perfect Fit】This cat water fountain filters tailor-made for W02B 3.5-litre pet water fountain, the filter dimensions match the machine’s slots precisely, ensuring smooth and effortless installation and removal. Each pack contains 10 filters, providing ample supply to ensure the fountain runs smoothly and reliably over the long term, sparing you the hassle of frequent purchases and allowing your beloved pet to enjoy fresh, running water at all times 【Triple Purification】The Cat fountain filter built-in activated carbon powerfully absorbs odours and residual chlorine, whilst the ion-exchange resin effectively softens minerals in hard water. The outer layer of precision cotton filter fabric traps hair and suspended particles. These three layers work in synergy, filtering at every stage to transform tap water into clear, sweet-tasting drinking water, significantly improving the flavour and encouraging your pet to drink more 【Quick Activation】Before using a new filter for the first time, simply soak it in clean water for 5 minutes to activate the filter cartridge, then rinse gently under running water for 30 seconds before installing it. Routine maintenance is straightforward: replace the filter every 2 to 4 weeks. If you have multiple cats or the water is particularly hard, you may shorten this interval slightly to ensure every sip remains as pure as the first 【Sealed for Freshness】Each pet fountain filter is individually sealed in moisture- and dust-proof packaging to lock in its filtering efficacy for the long term. Open only when needed to prevent contamination or degradation of unused filters, ensuring consistent and reliable quality. Stock up in bulk without worrying about deterioration—it’s both economical and ensures your pet’s drinking water remains healthy at all times 【Reliable Support】We are committed to high-quality materials and rigorous quality control, ensuring that every pack of filter cartridges delivers consistent filtration performance. We take great care in crafting every accessory, so you can buy with confidence and use with peace of mind