I have been using a reverse osmosis system for many years. I usually get new filters from Costco. Since it is no longer available from Costco, I received this filter set from Revain in April. Surprisingly, the new filter this time only lasted about 3 months before showing up at hard water symposiums. I know we live in a hard water zone, but new Costco filters used to last at least 18 months. I'm not sure why there is such a big difference this time! Very disappointed!
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