A revolutionary design makes the water to go filter bottle an absolute essential for travellers backpackers and even commuters the bottle includes a pre attached filter that removes over 999 of all microbiological contaminants leaving clean water every time the bottle compartment of the filter bottle is dishwasher safe whilst the lid must be hand washed to keep it water tightr r the water to go filter bottle filter should be replaced every 200 litres approx 3 months