Efflorescence usually effects brick, concrete, stucco, and natural stone surfaces. Efflorescence is caused when water leaves behind salt deposits on the masonry surface.
The way you remove efflorescence depends on the type of surface you're dealing with. Options include:
Minimise the growth of efflorescence by lessening the amount of water that comes into contact with the surface as much as possible. Control the amount of water used in mortar and grout, direct water away from the surface with eaves, copings, gutters and look for a suitable irrigation solution.
Crown Trade Alkali Resisting Sealer