WatertoGo 50cL Water Purification Filter Bottle Removes Contaminants by 99.9%Our Unique 3 in 1 filter has been created based on technology originally developed for the NASA space programme. The filter works instantly to protect against bacteria, parasites and microplastics reduces chemicals like chlorine and improves water taste. The three technologies used in a Water to Go filter are: 1. Mechanical filtration; a very small pore size which stops contaminants passing through. 2. Electrical (by a positive charge) which reduces