If you are using a conventional well pump instead of a constant pressure well pump, then you are probably familiar with fluctuating water pressure that occurs during everyday tasks like watering the garden, showering or running the dishwasher. A conventional well pump will give you a 20 pound variable in pressure, leading to those types of fluctuations in pressure.
The constant pressure system will speed up or slow down the pump motor according to water demand. This will allow you to wash laundry, water the garden, and run the shower simultaneously without diminishing water flow.
A constant pressure well pump system operates with a variable frequency drive controller that automatically monitors household demand. Like the cruise control on a car, the variable frequency drive speeds up or slows down the pump depending on your household water requirements. The result is reliable, constant pressure where and when you need it.