There are three kinds of pumps we use; the booster pump, delivery pump and the permeate pump. The booster pump does exactly that; boosts pressure going into your system. The delivery pump also does what it says; delivers water to multiple sources or helps with long distances. The permeate pump is a useful pump if you have a drinking water system. It is an energy recovery device (ERD). The booster and delivery pumps can be used on all systems with the right conditions. The permeate pump can be used only on units that have a pressurized storage tank.