Pitting and spawning is a result of spreading salt to concrete winter after winter. Its a myth that table salt is easier on your concrete then rock salt; salt is salt. I am a concrete concrete contractor in Philadelphia and have been in the industry for over 30 years. Also I am a Snow Removal contractor in Philadelphia so am on both sides of the coin. I spread damaging salt to concrete steps and walkway and I repair damaged concrete steps and walkway due to salting. However the solution is a product that I we spray on our new concrete work called Saltguard. This stuff really really works and prevents the costly expensive of replacing concrete due to de-icing products. The name of my concrete company is Dependable Concrete LLC.