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Where are you buying the pre and carbon filters and what micron ratings are they? Is it a solid carbon block or GAC? What brand membranes were they and I second send the 100 GPD back and get a Dow Filmtec 75 GPD and nothing else, not an Applied nor a GE or especially any of the cheap e-bay knock off membranes.
Quality pre and carbon filters are what protects the membrane, try to skimp on price sacrifices quality which shortens the membrane life dramatically. I would also suggest getting a handheld TDS meter, the inline type is not very accurate as they are not truly temperature compensated, they read air temperature and how often are water temp and air temp the same?
What is your waste ratio and have you double checked it using a measuring cup or other device?
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