Reverse Osmosis product water is more acidic due to it's purity. By the time the water is processed through the various stages, after the reverse osmosis stage, minerals etc has been removed. To replenish necessary minerals, an alkaline filter is recommended. 5th stage of this system is an alkaline/ionizer filter. The alkaline filter, the 5th stage in this system is recommended, as reverse osmosis product water tends to be acidic due to the purity of the water. All minerals have been stripped from the water. To buffer the water to a more natural alkaline state, and to add essential minerals back ie. calcium, magnesium, potassium and sodium. We highly recommend the alkaline filter. This filter will increase the alkalinity without over correcting.
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