Deionization is a good additional stage when the source water has over 250 ppm of TDS as in most California water supplies. This process utilizes a Deionization resin which captures the excess contamination that the Reverse Osmosis membrane and filters leave behind. This type of water can be obtained at quality commercial sources or it can be made at the point of use by an under the sink Reverse Osmosis DI. The purity of this water is equivalet to distilled water and it is most desirable for people that can have allergies (often undetected) to water borne contaminants even in small concentrations.

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