Hard water, which is common in about 85% of all US households - is the silent killer of all extensions. Do not wash you hair in water that has no been softened. Extensions seem to be more affected by hard water than natural hair as they do not receive the natural oils from the scalp to protect them. Chlorine, calcium, iron, manganese, zinc and copper found in hard water will cause the hair to become dry, brittle, rough, tangly and will even cause the color to shift and fade in a matter of week. If you want to protect your investment, you will need to install a water softening system in your residence. A resin based water softening system needs to be filled with salt quarterly and serviced yearly. Please also note that you should only wash your hair 2x a week maximum.