Your claim was that, for practical purposes, it's not possible to have too much salt, as your kidneys will process any excess. The respondent's point was that

Your claim was that, for practical purposes, it's not possible to have too much salt, as your kidneys will process any excess. The respondent's point was that there is a threshold at which the amount of salt ingested is too much for what the body can handle. Obviously a pound is an unrealistic extreme, but it illustrates the point: there is a threshold. More realistically, it would not be unusual for somebody to have a daily salt intake that is a little over the threshold of what the kidneys can easily handle, and bit by bit, harm can develop, just as is the case with too much sugar, too much fat, too much alcohol, or too much of anything in any organic system.