How do I know when it’s time to change the 5 cartridges in my EauFlow RO unit?

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How do I know when it’s time to change the 5 cartridges in my EauFlow RO unit?

Either:

  1. Cartridge lights 1,2,3 & 5 are flashing on the display OR
  2. Light 4 is flashing and your TDS reading is above 10
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