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【Premium 4-Pack Air Stones for Pond & Fish Tanks】This kit comes with 4 premium 5cm grey ball air stones, great for fish tanks and ponds. The weighted design lets them sink and stay firmly on the bottom, delivering stable aeration for your aquatic system. 【Durable & Safe Sintered Mineral Construction】Made of high-temperature sintered mineral material, these aquarium air stone diffusers feature long service life. Their porous structure is anti-clogging and maintains steady airflow, working well for freshwater & saltwater tanks, ponds and hydroponic systems. 【Efficient Oxygenation with Medium Bubbles】These high-performance aquarium air stone accessories generate dense, uniform medium bubbles to raise water oxygen content. Controlled bubble output improves gas exchange, building a healthier living space for fish, aquatic plants and beneficial bacteria. 【Simple Setup & Maintenance】Soak the air stone in water for 1 hour prior to connecting it to your air pump. Regular brushing helps avoid blockages and keeps stable performance. Suitable for hobbyists and professional users, it offers dependable aeration for all kinds of aquatic environments. 【Wide Application Scenarios】Perfect for fish tanks, landscape ponds and hydroponic planting systems. It helps maintain good water quality, meets oxygen supply needs of different aquatic creatures, and is a practical accessory for your aquatic setup.