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What works, what helps, what wastes your money.

Filters, purifiers, ventilation, and the rest, graded against the research. What each one actually handles, what it misses, and the popular fixes that do not work at all.

Stasis Home Research Every claim on this page is graded against peer-reviewed health research and linked to its primary source. Updated July 2026

Water

Pitcher and faucet filters Good for taste, read the box For chlorine taste, yes, a pitcher filter (the Brita style) earns its spot in the fridge.
Under-sink carbon filters Works, with blind spots Under-sink carbon filters solve the chlorine side of tap water: the taste, the disinfection byproducts chlorine leaves behind, solvent-type chemicals, and lead when the unit carries a lead certification.
Reverse osmosis Works, for the widest range Yes, reverse osmosis works, and it covers more water problems at once than any other filter you can put in a home.
Whole-house carbon and shower filters Right tool for the shower, wrong tool for some water A carbon tank where the water enters your home treats every tap, so it covers the air you breathe in the shower and bath, on top of the water you drink at the kitchen sink.
Water softeners Works, for comfort and appliances An ion-exchange softener does the one job it is sold for, and does it well.

Air

Light

Circadian lighting (smart bulbs + blackout) Works, on a schedule Light timed to the day is one of the few sleep interventions with consensus-grade evidence behind it.

Before you spend money

What doesn't work Save your money A whole category of home-environment products sells the feeling of a fix without the function.