Question:
i have a Frigidaire Gallery Series refrigerator which has a PureSource 2 water filtration system built into it.

i also have a GE water softener installed in my home.

my problem centers on drinking HUGE amounts of water (more than 1 Gallon per day easy) due to my high metabolism, so i am concerned about ingesting "trace" amounts of sodium that might be in the refrigerator drinking water tap...

are filtration systems like the Frigidaire Pure Source designed to remove sodium from a soft-water system, or are they made for cleaning out "larger" particles?

i have read in thie website and others that there are harmless trace amounts of sodium chloride left in the tap water of a soft water system...is this right?

Answer: Deionization of water is not the single best purifaction method there is for water, and other then being the best method for removing dissolved inorganics, it is the worst method for suspended particulates, disolved organics (herbicides, pesticides, resins, etc), microorganisms (bacteria, fungi, algae), viruses & pyrogens (fever producing bacterial cell walls). It has to be combined with ultrafiltration, carbon adsorbtion as well as ultraviolet oxidation, to get the purity you stated above.

Also, distillation is better then Reverse osmosis at removing dissolved inorganic solids, and is superior to RO for removing disolved gases, disolved organics, particulates, bacteria and pyrogen. Distillation is also the only single method capable of producing reagent grade water (type II), without any other filtration methods. Sometimes RO is used to pretreat the feed water, so as to avoid higher maintenance of the distillation equipment. And 100% pure water is impossible under any conditions.

"Ultrapure Water- Water with a specific resistance higher than 1 megaohm-cm. In the laboratory, it usually refers to ASTM D1193 Type 1 reagent grade water. Anything in laboratory water that is not H20 is an impurity. Although chemically pure water is NOT attainable, ultrapure water systems are now capable of reducing impurities down the limits of detection"