Why dermatologists recommend using shower filters

City water is treated with chlorine so it stays safe to drink. That same chemistry shows up in hot showers — on skin, in hair, and in the steam. That is why dermatologists often talk about water quality when patients deal with dryness or sensitive skin.

What the evidence and experts say

• The American Academy of Dermatology notes that chlorine exposure can damage hair over time (they discuss this most often in the context of swimming).
• A USA TODAY 10Best report interviewed multiple board-certified dermatologists about shower filters. Views were mixed on how dramatic the results are, but several noted that people with sensitive skin or eczema may notice water quality more — and that trying a filter is low-risk.
• Research on hard water and skin barrier irritation helps explain why what is in your water can matter for dryness and irritation, especially alongside soap.

What this means for Brook

Brook is a shower filter designed to cut chlorine at the shower arm. It is not a medical device, and it is not a treatment for eczema, acne, or any skin condition. If you have a skin condition, talk with a dermatologist.

We share these sources so you can read the evidence yourself — not as a claim that dermatologists endorse Brook.