Pretty sure on the back of the bags of some groundbaits, I think Sonubaits, it tells you the recommended ratio. I'm never that accurate and usually mix it up over wet at home, then it dries out, sometimes because I've added micropellets, by the time I'm on the bank. Think Lee Kerry recommends doing it that way in one video, overwetting, then letting it dry out, though I suppose that could effect the activeness of the mix if you think about it in great detail.