Centrifuge/electrolyzer question

  • Is there a way to selectively input certain amounts of dusts into the centrifuge/electrolyzer and to keep extra in a holding area until they have the amount required by those machines? Right now we have a buildcraft pipe loop that loops excess/different dusts above the centrifuges/electrolyzer and this setup works decently for the most part until you run into smaller amounts of dust, then they just get stuck there waiting for more of the same type to enter. Im new to the whole item transport system in gregtech and I'm almost positive there is a solution to this, any thoughts?