Tommee Tippee Closer to Nature Perfect Prep Replacement Filter is designed for Perfect Prep machine Tommee Tippee Closer to Nature Perfect Prep Replacement Filter is designed to remove impurities in your water and each filter is estimated to last up to 3 months. On your Perfect Prep machine, a warning light indicates when your filter is coming to the end of its life and it flashes when it needs filter replacement. Tommee Tippee products are designed with you and your baby in mind from non-toxic plastics and are made to the highest manufacturing standards. Features: Only for use with the closer to nature Perfect Prep machine Filter system removes impurities in the water 150 Litre Capacity Lasts up to 3 months The Tommee Tippee Closer to Nature Perfect Prep Replacement Filter is an awesome filter compatible with Closer to Nature Perfect Prep machine.