Wasatch Front municipal water at 200–400 ppm hardness deposits calcium carbonate (lime scale) on exterior surfaces, in drainage channels, and in weep holes. On masonry, this appears as efflorescence — white surface deposits — as moisture migrates through the masonry and evaporates, depositing dissolved calcium at the surface. Efflorescence is primarily aesthetic, not structural, and can be removed with dilute acid wash (muriatic acid, properly diluted) and a stiff brush. Persistent efflorescence indicates ongoing moisture movement through the masonry that should be addressed at the source: improving drainage, sealing mortar cracks, or improving the flashing at the top of masonry walls. On horizontal concrete surfaces, calcium scale from irrigation overspray accumulates around joints and in surface texture over time and requires periodic acid washing to prevent buildup that obscures decorative finishes. Penetrating sealers on concrete and breathable silane/siloxane sealers on masonry reduce the moisture movement that deposits calcium in the first place.