Review on Dow TW30 100HR Rejection Replacement 1812 by Robert Correa

I only bought this a month ago and since then the TDS ppm has kept going higher than my previous 50 gpd membrane which I've been using for 5 years and the TDS of the old 150 membrane was lower than this membrane which is 200ppm. I then changed all the other filters as well, hoping that the PPM (tap water in the city is around 300 ppm) would drop significantly, but NOT quite. I thought some reviews rated it highly and it's made in the USA not China so I bought it. However, he was very disappointed and unfortunately I cannot return or exchange it as it has been 30 days and Revain and the seller have not answered my emails or calls regarding the exchange. Waste of my $35 on this membrane and my other $30 filters and installation time!