【UPGRADED SAFETY】: Waterdrop inline water filter uses food-grade materials, no contaminants will be leached back into the water, therefore you could enjoy safe and clean water. 【LONG-LASTING FILTER】: Inline water filter certified by NSF 42 and it had long durability which could last 3 months to provide clean and crisp drinking water with every sip at its best, giving you an amazing way to enjoy outdoor activities.