It is recommended to use a pressure tank especially when a pump is connected to a toilet cistern. After a toilet is flushed it fills slowly and can cause a pump to cycle (switch on and off) until the cistern is full. Installation of a pressure tank will assist in eliminating this cycling.
Pressure Tanks are recommended to be installed in-line with pumps as they are:
An energy saving device
Eliminates the pump starting each time a tap is turned on
Extends the life of your pump
Protects against heat expansion
Stops water wastage from hot water heaters
This means that when a tap is turned on, the water in the pressure tank is used first prior to the pump being turned on. Once this (Draw Off) water is used, the pump will start. When the tap is turned off, the pump will continue to run to fill the pressure cell tank before the pump turns off.
Davey Supercell 40P Steel Tanks with Captive Diaphragms
Supercell steel shell tanks include the latest internal designs for long tank life
P & G model Supercells have FDA approved captive diaphragms with virgin polypropylene wetted area liners and patented stainless steel water inlets
The exterior is finished in high quality polyurethane over an epoxy undercoat for years of reliable life
The larger capacity G model Supercells also feature a patented controlled action diaphragm assembly which provides a separation between diaphragm and tank walls, thus extending tank service life