Acidic water causes green or blue stains caused from the deterioration of plumbing and components of plumbing in your home. This effect will cause leaks and also damage appliances. Acidic water can increase metal levels in your water to an unsafe level. The water taste will also be affected by acidic water which will have a metallic taste. The equipment needed to correct the acidity will depend on the PH, Alkalinity and TDS of the water. Acid neutralizer with calcium carbonate, soda ash (sodium carbonate), caustic (sodium hydroxide) are the most common treatments.