We have two kinds of tanks for pumps, steel and stainless steel. The main size is 24L and 50L. The inner membrane is EPDM.
Each pressure tank is constructed to store supply water under pressure to provide a buffer for your plumbing or piping, to minimize pump operation time and to maximize pump life. Pressure tanks help to elongate the pumps lifespan because they allow them to run when they are needed verses staying on. A pressure tank extends the time between pumping cycles by saving up some pressurized water for delivery later. Pressure tanks store pressurized water that can be distributed to different areas. This system usually solves any freezing problems by placing the pump deep inside the well, and the pressure tank indoors.