Not sure what's up with them but bought the white ones thinking they would work . I just realized I could use my blue ones for up to 2 years and I've only used them 1 year at a time. Too late. I use white and the water quality is WORSE (difference in ppm - use a zero filter tester). I'm not sure what's going on but it seems the longer I wait the worse it gets. I don't know how long to filter water but I waited 5-10 minutes and it went from 100-200ppm with blue first to over 300 and now 400ppm. I'll let it flow for a few more minutes, but I'm very angry. We filter THIS water through a zero drinking filter and it only took 1 1/2 months where these filters normally last 4-6 months. UGHUpdated: After the second one seemed to have the same issue, I contacted the company. We have a lot of calcium in the area (neighbors told me) so maybe that's why we have such a high ppm level. We will be looking at ways to test our water in other ways to see if it will extend the life of our zero filter and hopefully lower the ppm in other ways.
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