Are reverse osmosis water filters worth the cost?
For families with pregnant women, babies, or PFAS concerns, yes. RO catches nanoplastics and PFAS that pitcher filters miss.
What's actually in it
Reverse osmosis (RO) pushes water through a very fine membrane that blocks dissolved salts, heavy metals, PFAS, and nano and microplastics. The filter wastes some water and removes beneficial minerals, which you can replace with a remineralization cartridge or by eating a normal diet.
Pitcher filters and most faucet filters use carbon. Carbon removes chlorine taste and some chemicals but doesn't catch PFAS reliably.
What the research says
A 2025 study in NPJ Clean Water found microplastics still reached the consumer tap after municipal treatment. A 2025 case-control study linked PFAS in home dust and water to higher childhood leukemia risk.
An under-sink RO system costs a few hundred dollars and pays off over bottled water in under a year. For households with babies, pregnancy, or a known PFAS problem in the local supply, it's one of the highest-impact health upgrades you can make at home.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Microplastic removal across ten drinking water treatment facilities. | NPJ Clean Water | 2025 |
| Exposure to PFAS in residential settled dust and childhood leukemia. | Int J Cancer | 2025 |
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