If it has zero stars I give it zero stars. I bought this filter set to replace the old filters I used in my Bluline G5 reverse osmosis system. After installing the filters I tested the water and it showed a pollution level of 110ppm. Then today I checked the water coming straight out of the carbon filter and it showed 210ppm which is the same as the water coming out of the tap. This set of filters does not work at all. I paid over $60 and got these bad filters. I also emailed the seller 3 days ago but he didn't reply. DO NOT buy this filter set from this seller!
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