Double Damage from Pool/Seawater
Chlorine: Oxidizes pigments, turning light-colored hair extensions green/yellow, and disrupts protein structure. Salt: Osmotic effect, pulls out moisture from hair.
Pre-treatment: Before shampooing, thoroughly wet hair with clean water or leave-in conditioner (chlorine/saline absorbed after saturation decreases).
Afterwards: rinse immediately with clean water after getting ashore, and use a deep repair hair mask.