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A Filter Past Its Life Is Not a Weak Filter
Of everything on this site, this is the part that decides whether any of the rest of it did anything.
The takeaway
A filter past its rated life is not a weakened filter. EPA states that filters are only effective if they are maintained according to the manufacturer’s instructions for how long the filter or membrane lasts before replacement, and nothing observable at the tap tells you when that point has passed.
Source: U.S. EPA, Identifying Drinking Water Filters Certified to Reduce PFAS.
What EPA says, plainly
Filters are only effective if they are maintained according to the manufacturer’s instructions for how long their filters or membranes will last before they need to be replaced.
Not maintained well. Maintained according to the instructions, which carry a stated life. Past that life, a certification is a statement about a device you no longer have.
Source: U.S. EPA, Identifying Drinking Water Filters Certified to Reduce PFAS.
Why it goes wrong so reliably
Because nothing announces it. Flow stays acceptable for a long time. The taste change people associate with filtering often persists after the capacity that mattered is gone. There is no indicator on most of them, and the ones with indicators are usually counting time rather than measuring anything.
So the device passes every test a household can perform on it and has stopped doing the thing it was bought for.
The service lives to plan around
EPA’s guide puts pitcher and faucet cartridges at roughly two to six months, refrigerator filters around six months, and under sink filters from six months to over two years.
The longer-lived ones are the ones most likely to be forgotten, for obvious reasons. A calendar reminder set on the day of installation is the entire solution and almost nobody sets one.
Source: U.S. EPA, Choose the water filter that’s right for you.
Volume matters as much as time
A stated life assumes a usage. A household putting far more water through a device than the rating assumes reaches the end of its capacity before it reaches the end of the month on the label.
If a filter is doing the cooking water as well as the drinking water for a large household, the schedule on the box is optimistic for you.
And the cost that is easy to miss
The cartridges. EPA publishes replacement cost ranges alongside the device ranges, and over a few years the consumables are frequently the larger number.
It is worth working that out before buying rather than discovering it at the first replacement, which is when a good many of these devices quietly stop being maintained. What the number is made of.
Read your report before you buy anything.It is published about your own system, it costs nothing, and it is the only thing that turns “I want a filter” into a question with an answer. If you do want something installed after that, we will route you to a contractor covering your area, matched on your ZIP code — you are never charged. Filtration is only our subject — every sort of plumbing job can be routed from here.
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