The Endurance Filter utilises a cat ion resin which in combination with the Peak Water bypass system, allows for control of the alkalinity in the water. The Endurance Filter lowers the overall TDS to a lesser degree than the Precision Filter, but allows for alkalinity control whilst maintaining a significantly longer life and number of litres filtered.
The Filter also contains activated carbon to treat contaminants in the source water, as well as a sodium buffer to help stabilise PH.