considering a comforter, and light soil....probably 1X to 2X as much as a normal FL washer
for normal clothes and soil level.....its a basic formula of single, double, or triple loader.....as to one cap measurement for a single, 2 for a double, and 3 for a triple......
but using todays HE is best.......some guys can get mounds of suds from SearsUP, I cannot, but the advantage for me is chemical concentration......even in my Neptunes, for a heavy, greasy, grimy load.....I can add anywhere up to 5 scoops, and not worry about oversudsing......and clear rinses