A shower filter that attaches to the head helps a lot! You can get a decent one for 20 bucks. Otherwise any good ol' low poo, especially with coco betaine will do the trick. You don't *need* a chelating shampoo, unless you have blonde hair that turned orange, or have some major buildup issues.
2c-3a - coarse - normal-high porosity - high density - growing out to donate
POOS: Sevi Seabuckthorn, Neutrogena Anti-Residue
RO/LI: Suave Coconut / KCKT
PT: CNPF, gelatine mix
COLOR: henna, amla & indigo
= humectants in low dews