Remove calcium buildup from plumbing with white vinegar or commercial CLR products. Soak removable parts like aerators and shower heads in vinegar overnight. For interior pipe buildup run a vinegar flush through the system or use a professional descaling treatment. Installing a water softener prevents new calcium deposits from forming. Hard water above 7 grains per gallon causes significant buildup. Regular cleaning every 3 months maintains flow and extends fixture lifespan.