All foreign matter is cancerous to concrete and masonry.
These cancerous substances embed themselves in masonry creating, crumbling, cracking, and dusting. This gel is chemically forced into the pores and by capillary attraction is absorbed into the voids that exist within all concrete. This process repeats itself until the masonry is entirely sealed. This reaction also purges most foreign matter to the surface, where it can be removed, thereby removing the cancerous particles from the masonry. This process will stop hairline cracking, crumbling, and pitting and also increase the density of the masonry.