I have the red constant light, how do I know if I need this filter or the third stage filter?

Zero Installation Purifier will notify you for recommended filter change(1st, 2nd and 4th stages) via Blinking Red Light every 12 months. Steady Red Light notification will alert you for recommended reverse osmosis membrane(3rd Stage) replacement every 24 months.

I bought the black zip model in 2016. i thought i needed to replace 1 filter after 6 months, and 1 every year. which filters do i need to buy??

This full set of filters (Amazon part number B016NN5L06 ) that need to be replaced after 12 months of use, namely the PP 5 micron filter, the carbon filter, and the post filter. The 75 GPD RO MEMBRANE ( Amazon part number B01FLEHHYG ) that has to be replaced every 24 months, you can key in here https://www.amazon.com/gp/offer-listing/B01FLEHHYG/ref=dp_olp_new_mbc?ie=UTF8&condition=new

Is the second stage carbon block (as shown in the description of the initial set of filter for the product), or Granulated carbon (as shown here)!

Thank you for noticing the error in our Replacement Filters Listing. ZIP comes with Carbon Block Prefilter. We have updated ZIP replacement filters listing to reflect correct information.

Orange/ yellow light after replacing the filters? What could be the reason and how to make the system functional again? Resetting is not working.

If the light is flashing yellow then it means that the pitcher is not inserted or mounted properly. I have found that this issue can be corrected by doing two things. 1) wash the supply pitcher thoroughly inside and out. When the pitcher gets dirty outside it does not seem to mount properly. 2) the grease the supply pitcher coupling to the RO unit gets used or dried up. Add some food safe mineral oil, bees wax, or dow corning 111 to refresh (this is what was supplied on the pitcher grommet when it was new); then the pitcher should mount properly. If the light is fixed yellow then it either means that the filtering cycle is over or you have not supplied enough water. If the pitch is full then see the remedies I described above.

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