BY NENA GROSKIND EVERYTHING YOU WANT TO KNOW ABOUT THIS CRUCIAL WINTER STAPLE PLEASE PASSthe 34 CONDOMEDIA SALT I t's time to talk about salt. Not the substance you sprinkle on your food, but the material you use to melt snow and ice. This may not be a conversation you particularly want to have, and that's understandable. No one who endured the last winter from hell (which would be anyone living in New England) wants to be reminded that another winter is coming. And salt isn't the most scintillating topic imaginable. But it is important. Most community associations in snow-burdened climates use it, and the board members and managers who purchase the substance, or oversee the contractors who buy it, probably need to know more than they do about the salt being spread on their roads and walkways.