At home, we have a 5-stage reverse osmosis water filter in the kitchen. While replacing the filters today, I realized I don’t know what that 5th filter actually *does*. This filter which comes *after* the reverse osmosis filter itself is a chlorine odor and taste filter which made me wonder, why does a reverse osmosis filter need to be further purified? Shouldn’t the chlorine have been removed already? Isn’t the end product of reverse osmosis pure water? Please send help…
P.S. an explanation of why minerals additives make water taste better would also be appreciated.
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Pure water has a taste, each mineral has its own taste. Our bodies need trace amounts of many minerals to be healthy, so we have evolved to enjoy water that provides those minerals.
The post carbon “filter” adds those minerals back to improve taste.
There is some slip of dissolved solids past an RO membrane. RO should remove essentially all calcium, most chlorine and hydraulically split sodium.
But some chlorine could slip through the membrane. I think the chlorine taste would be more pronounced since there are no other minerals to mask the taste.
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