Honestly Buds, that reference about watering from the top was talking about roses.... so I just assumed that would apply to all plants.
As for washing out bad water/nutes, I'm going to be using a super soil, so I'm trying to keep all of my nutes from washing out. Remember, I'm not even a novice yet. I'm still just a noob who theorizes about his potential grow. You would know more than I, so take what I say with a grain of salt.