For added convenience there is no need to use bottled, filtered or pre-boiled water in the Perfect Prep machine. Our filter features a filtration membrane designed to remove bacteria, impurities, and contaminants that can be found in water. Water passes through an anti-bacterial filter to ensure it is clean and safe just like boiled water from a kettle. Do these filters fit both the original and Day & Night Tommee TippePee Perfect Prep machines? The Tommee Tippee plain white filter and blue/ white filters are compatible with both Perfect Prep Machines. Can I use other branded filters in my Tommee Tippee Perfect Prep machine? We recommend that you only use Tommee Tippee Perfect Prep Replacement Filters in the Perfect Prep machine. The filter may look a lot like other water filters but inside is a filtration membrane designed to remove impurities and contaminants. Most standard water filters do not include an anti-bacterial filtration membrane so will NOT remove bacteria. It is therefore