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 ResearchEvery claim on this page is graded against peer-reviewed health research and linked to its primary source.Updated 2026-06

Water

Pitcher and faucet filtersGood for taste, read the boxUnder-sink carbon filtersWorks, with blind spotsReverse osmosisWorks, for the widest rangeWhole-house carbon and shower filtersRight tool for the shower, wrong tool for some waterWater softenersWorks, for comfort and appliances

Air

HEPA air purifiersWorks, on particlesHVAC filters (MERV ratings)Works, for the whole-home baselineMechanical ventilation (ERV / HRV)Works, but it is the big retrofitHumidifiers and dehumidifiersWorks, for the right problemRadon mitigation (sub-slab depressurization)Works, the settled fix

Light

Circadian lighting (smart bulbs + blackout)Works, on a schedule

Before you spend money

What doesn't workSave your money

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