One 40 - ounce size lets you do 106 average size loads of laundry. (thetoddle.com)
As for how much detergent to use, Reinhardt recommends using «the same amount of detergent for cloth diapers that you would use for a same size load of heavily soiled clothing.» (care.com)
Since we line - dry a lot of our laundry during the summer, I tested the Woolzies Dryer Balls for almost a month with a variety of different size loads. (thinking-about-cloth-diapers.com)