The Duraplas Securitank liquid fertilizer storage tank is a combination of a liquid fertilizer polyethylene tank and flexible storage bag. The flexible bag is placed inside the tank, which results in a double wall with retention between the tanks. Along with a metal case with alarm leak detector, the Securitank features an overfill system, a digital gauge indicating fill level, a 30 mega amperes electrical deferential switch. A stainless steel pump can be place in the tank to fill the sprayer, and suction and filling valves are located at breast height.