amtra technik 增氧大流量过滤阝 除油膜 6天仅用1度电 德国静音技术 运行只有流水声 AMTRA has focused on the aguarium for 30 years Let the fish add a bit of fun to your life. 清澈过滤免换水 五年质保 正品保证 除油膜吸粪便