Quick Answer
Winterize a pressure tank by filling it with a 50/50 mixture of water and antifreeze, adding a 1/2 cup of non-toxic, RV-grade antifreeze per 10 gallons of water, and then sealing the tank to prevent new water from entering.
Preparing the Pressure Tank
Before starting the winterization process, ensure the pressure switch and other electrical components are turned off, and the pump is disconnected from the power source. Remove any screen or debris filter from the tank’s inlet and outlet connections. This will prevent damage from freezing water or debris.
Filling and Sealing the Pressure Tank
To fill the tank, attach a hose to the tank’s inlet connection and direct it to a water source. Fill the tank with a 50/50 mixture of water and antifreeze, adding 1/2 cup of non-toxic, RV-grade antifreeze per 10 gallons of water. For example, for a 20-gallon tank, use 1 cup of antifreeze and 20 gallons of water. Once filled, seal the tank by closing the inlet valve and ensuring there are no other sources of new water entering the tank.
Additional Considerations
It’s essential to check the tank’s capacity and ensure it’s designed for your specific water demand, as undersized tanks can lead to reduced water pressure or even pump failure. For example, a general rule of thumb is to size a pressure tank for 2-5 gallons per minute (GPM) per household user. Additionally, consider the elevation of your property and the size of your pipes when determining the correct tank size.
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