Yeme Twin Filter Alkaline Flask - Make up to pH 10.0 Water 13.5oz Portable Alkaline Water Flask - Twin filter technology - replace filters once a year Drink Hydrogen Rich Anti Oxidant water on the move New 13.5oz/400ml Food grade stainless steel flask keeps drinks at a constant temperature for up to 6 hours Takes 5 - 10 minutes to produce fresh alkaline water - pH up to 9.5 ORP -160 a proven antioxidant - pH varies depending on water quality. Micro clustered water molecules improve hydration, cell penetration and health.