Heat the 4quarts water, grated bar, borax and washing soda over medium heat, stirring occasionally, until soap is melted. Let cool for about an hour. Stir in 3gal hot water. Cool and add to containers. Use 1/2cup full per large load. Has a light lemony scent, but if scent is your thing a splash of essential oil in each batch could be added. The borax, soda, and bar was found in the laundry aisle at my nearest hy-vee grocery store, but wal mart does not carry 2 out of the 3. Also, for me, as the soap was cooking, there were a few fumes that made my eyes water, so good ventilation whilst its on the stove might be a good idea, however afterwards there is no fumes, and my sensitive skin peeps have had no reaction : )~~~< The cost for soda and borax was less than $4 a box, and the bar was less than a $1. So for this recipe I can make 86 gallons for $15, but i am gonna try the ultra concentrated version and let ya know