i always had the theory based on clark that a 30 day dose of 1 tablespoon morning and night for 30 days and then 1 tablespoon weekly for life....this takes 4 bottles the first year; thus we made the biggest price break for 4 bottles...
based on many years of listening to people and reading about parasites i also always suggested 1 drop of pure oregano and some source of olive leaf 7 days a week for life, or simply take a little of the dewormer every day.
many ask doc sutter, his goal is more, which isn't bad, but when you mention more, it often scares away the customer because of the price..