A measure of how effectively the filter removed flavor taints, along with the resulting odor taints, that CR added to plain water with minimal intrinsic flavor and odor (the "control" water).

Always check the reviews first to make sure the filter's actual function matches what it claims -- water quality is something you don't want to compromise. At Costco, you can find a Brondell ...

Overall score for the Brondell O2+ Revive is mainly how well the model removed dust and smoke from a test chamber, plus quietness for room purifiers and airflow resistance for whole-house units.

The best filtered shower heads help remove chlorine and other unwated substances from your water. See our top picks for 2025.