I find that using two carbon filters in my five stage reverse osmosis system protects the filter membrane better from chloramine added to the water. I have had issues with other filters I have purchased from Revain but these work very well. I installed them with a new membrane about 6 months ago and they are still effective. I will be replacing them soon and hopefully this will prolong the life of the expensive and rather difficult to replace membrane. Subjectively, I find that my water tastes better with these filters.
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