I got this system originally in the Installed in 2017 and has been fairly good at changing out the various filters about once a year or so, but usually at the recommended intervals. Oops. In 2019 I made a wiser and bought replacement filters for 3 years both because it was cheaper and because I thought it might inspire me to change filters in time. Not so much - with the pandemic I completely forgot about 2020. If only we could forget 2020 altogether. Anyway, I finally decided to replace all the filters, including the reverse osmosis membrane (I mean they recommend every 2-3 years, so 5 years made sense in this small house ;-). I made quite a mess but I managed to install everything! Well, almost everything - in the spare filter box there was only a set of quick-change nozzles for the 5th stage filter, which I used back in 2019. Of course, I didn't discover that until *after* I disassembled the whole system. Pooh. I called the folks at iSpring and Sean sent me two sets of quick-change tips, one for each of the Stage 5 filters remaining in my box. Thank you Sean! Amazing customer service. So now I have beautifully clear water and know that the iSpring staff is always ready to help if something goes wrong. Tip: Water gets everywhere even if you are very careful. Before you begin, make sure you have enough towels on hand.
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