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Unfortunately you bought a very low quality system, the price should have been an indicator, but you are not the first. With RO/DI you really do get what you pay for and its proven over and over. My tap water TDS is 835 and I get a RO only TDS or 5 to 6 and my DI is always 0. It takes high quality components to produce water like that but any of the reef quality systems found here on RC should get you in the RO only TDS range of 12-15 and DI of 0 or very close to it. Personally I would return that unit telling them you are not satisfied with its results and spend about $160 on a system that is proven to perform. I hate seeing reef hobbyists takne in by false advertising and bogus claims from some e-bay vendors. Its a bad thig but e-bay does not police vendors and their claims unlike those who sell in printed media or on TV or radio wher the Federal Trade Commission makes vendors live up to their claims.
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