Replacement FilterRemoves impurities in the waterLasts up to 3 months*For use with the Tommee Tippee Closer to Nature Perfect Prep machineGetting enough sleep is a real challenge for many parents. But its so important to our wellbeing and our ability to parent on.Perfect Prep Day and Night from Tommee Tippee is a dream machine to help you do just that. Not only does it prep the perfect bottle in two minutes, its also sleep friendly with added features specifically designed to make night feeding so much easier. The Tommee Tippee Perfect Prep Day and Night machine - making bottle feeding a dream right around the clock.Anti-Bacterial FilterYour Perfect Prep Day and Night is designed for use with water straight from the tap. The unique filtration membrane removes bacteria and other contaminants that can be found in water, ensuring your water is clean and safe to make a bottle feed, just like boiled water from your kettle.Guaranteed to remove bacteriaThese are genuine Tommee Tippee