Chlorine, calcium and copper build up fast — especially in Houston, Atlanta, Phoenix, Las Vegas and Charlotte. On 4-type hair and melanin-rich skin, that buildup adds up.

Time to swap when: the filter turns yellow or brown, or pressure drops.

How: 60 seconds. No plumber. No tools. Twist and replace.

Then wash day feels filtered again. Your scalp stops tightening. Your skin stops fighting back.