I thought in soil just straight RO and then add a light feed for the last litter of two you put in...but I've not really done this often so I don't know how correct that would b lol. But I think that's how I'm going to do it. That's how tang does his midway flush, must b at least some what right lolIn coco we use a lite solution so as not to mess up the the buffering. Is it not the same in soil?