10:1 means 10 parts water to 1 part product. part means units of measure i.e. gallons, ounces, lbs, etc. If you mix 10 ounces water to 1 part product, you have a quantity of 11 ounces mixed 10:1. there are 128 fluid ounces in a gallon. to mix a gallon of product at 10:1, you would mix approx. 11...