Filter Myths
A pitcher filter in the fridge, a filter built into the refrigerator door, a five-gallon jug delivered every few weeks — all of these feel like you're taking care of your water. And in a narrow sense, you are. The problem is what most people assume they're getting versus what these products are actually certified to do.
Standard pitcher and refrigerator filters are certified under NSF/ANSI 42 — the “aesthetic effects” standard. That covers chlorine taste and odor, and that's essentially it. It says nothing about lead, PFAS, nitrates, arsenic, fluoride, or disinfection byproducts. Those contaminants pass straight through a standard carbon filter, whether it's sitting in a pitcher or built into your refrigerator door.
Premium cartridges (Brita's Elite/Longlast+ line, for example) add real coverage on top of that — they're independently certified for lead reduction and for two specific PFAS compounds, PFOA and PFOS. That's a genuine improvement. But it's not the same as PFAS removal as a class, since dozens of other PFAS compounds aren't covered, and it's still a narrower scope than what a proper reverse osmosis system is built to handle.
Granulated activated carbon — the material inside nearly every pitcher and fridge filter — has an effective pore size around 5 to 10 microns. Microplastics range from about 1 micron up to 5 millimeters, and a growing share of the research attention is actually on nanoplastics, the sub-micron fraction below that range entirely. A standard carbon filter, sized the way it is, was never engineered to physically exclude particles that small. Even Brita's own newer filter that does carry a microplastics certification is only rated down to 0.5 to 1 micron — the nanoplastic fraction still gets through.
This is exactly why bottled and jug-delivered water isn't automatically the safer choice people assume it is. A widely cited 2024 study published in PNAS found bottled water averaged roughly 240,000 plastic particles per liter — and about 90% of those were nanoplastics, introduced in large part by the bottling and packaging process itself. Switching from tap to a delivered jug doesn't sidestep the microplastics conversation. In some cases, it adds to it.
This is the part that's easy to overlook: a pitcher filter, a fridge filter, and a delivered jug all treat one container. Your shower water, your washing machine, your dishwasher, and every other tap in the house are still getting whatever's actually coming through your service line — chlorine or chloramine, hardness minerals, iron, whatever your specific water source carries. A filter on your countertop was never going to touch any of that, because it was never designed to.
None of this means a Brita is a bad product — it does what NSF 42 says it does, and that's a real, useful thing. The issue is only the gap between what people assume it's doing and what it's actually certified for. Whole-home filtration and an under-sink reverse osmosis system close that gap at the source, for every tap in the house, not just the pitcher in the fridge. A free water test tells you exactly what's actually in your water before you decide what's worth filtering.
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