TheDude -- As long as it's a one to one mix, you can use any volume as long as you use the same volume of each component. Go to WalMart and buy a set of metal measuring spoons for around $1.00. Then use one tablespoon of each, or two tablespoons of each, or one 1/2 tablespoon of each, etc. But be sure the correct mix is one volume to one volume. If it's one pump stroke to one pump stroke, the two pumps may be set up to give different volumes, such as three to one for one pump stroke of each. -- JohnP