Tommee Tippee Perfect Prep Replacement Filters contains 2 anti-bacterial filters that are designed for use with water straight from the tap, for a safe, clean bottle every time. Tommee Tippee Perfect Prep Replacement Filters contains a unique filtration membrane, the anti-bacterial filter 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. Each filter lasts up to 3 months - Tommee Tippee only recommend you use Tommee Tippee filters with the Perfect Prep machine. Your Perfect Prep machine will notify you when the filter is due to be replaced. Based on 6 x 260ml feeds per day Tommee Tippee Perfect Prep Replacement Filters are designed for use with water straight from the tap, so there is no need to pre-boil the water using a kettle or use bottled water. This filter features a unique filtration membrane which removes bacteria and other contaminants that can be found in wat