I purchased this membrane and filter set on April 5th, 2019. I usually buy every 18-24 months when the TDS test is above 35. I have a household of three people; without overuse. My normal TDS after install is 8 to 12. TDS is now testing/reading 60 to 73, well above my 2 year backup plan or 35 TDS threshold. The overall TDS of an unfiltered faucet is between 170 and 200. No change in water pressure or hardness, membrane failure in less than (5) months. I don't see any warranty information, but this is not normal; I will update my review after Fresh Water Systems reply. 09/07/19 Changed to one star, seller is not responding.
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