#filtration

Under-sink RO for everything I drink and cook with, and minerals added back deliberately rather than filtered around.

Filtered drinking water and an unfiltered shower solves the smaller of the two exposures. Chlorine you inhale in a hot shower never touches your tongue.

The furnace fan run deliberately rather than only when it heats or cools, with a MERV 13 filter in the return. It is the one thing in the house that touches every cubic foot of air.