This is whats on out kitchen faucet. It has a "Filter Life Meter" that controls nothing. It's just there as a reminder to the user. I've cut the old filters apart to inspect and see how they work. You can use them for as long as you want, welllll past their recommended change interval if your water isn't bad. We live about 2 miles from the treatment plant, and I use the filters nearly double as long as their rated with no bad effects at all.
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Same type filters used in this if you want a pitcher filter. http://www.homedepot.com/p/DuPont-M...Pitcher-White-WFPT200X/203445578#.UnAwlVNREy0
View attachment 3128
Same type filters used in this if you want a pitcher filter. http://www.homedepot.com/p/DuPont-M...Pitcher-White-WFPT200X/203445578#.UnAwlVNREy0