Alkaline post-filters are used after the RO membrane in some systems to adjust the final taste or mineral profile of the drinking water. They are a finishing conversation, not a replacement for the membrane or pre-filters.
Where it fits
Reverse osmosis water can taste different because dissolved minerals have been reduced. Some customers like a post-filter that changes the final taste profile.
Some customers prefer the taste of water after a remineralization or alkaline-style post-filter.
The post-filter does not replace the RO membrane, carbon block, or sediment filters.
Post-filters have a service life and should be changed on schedule.
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