The sensor indicator, which turns green, then yellow, then red to indicate the filter needs to be replaced, died on two different sets. I bought the first block to replace the old version (which lasted me 3 years and turned out better). I ran into an issue where the touch light went out after owning it for about 5 months and then replaced it with a new system (with the same touch indicator light system) and the new system didn't last 2 months before that light went out. general. If you have this version, make a note of the date the filter was changed and make sure you change it regularly. The old non-illuminated sensor version was more reliable and I plan on going back to that or even switching to a different brand than Brita.
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