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Pump Winterization Tips

Pump Winterization Tips

Winterization season is right around the corner… are you prepared?

Correctly winterizing a pump is essential – if a step is missed, the pump can sustain damage due to freezing, costing you valuable time and money. Whether this is your first time winterizing a pump, or your fifth, these easy steps will help walk you through the winterization process and will leave you feeling confident that your customer’s pump will be protected all winter long!


Turn off the lawn controller and source water valve – break the suction vacuum.


If feasible, disconnect the water source and discharge piping.


On the pump case, open both top and bottom drain valves to remove water from the pump chambers.


If blowing out your irrigation system with pressurized air, use a narrow box wrench to prevent the shaft from spinning. When the impeller spins too fast, the motor governor can be damaged.


Once the water is drained from pump case, close all drain valves.


Fill the pump case just past the eye of the impeller with Munro Freeze Defeat pump winterization fluid. This will keep cast iron pump cases from rusting and keep the impeller free for spring start-up. Note: Freeze Defeat is sold as a concentrate. For best results, please follow mix instructions on the Freeze Defeat bottle.

For a more efficient and smooth pump winterization, use Munro Freeze Defeat pump winterization fluid – Munro Freeze Defeat prevents damage due to freezing, helps protect pumps from corrosion, and ensures longevity by minimizing rust on the inside of the pump.
Learn more at https://www.munropump.com/freezedefeat

And to make winterization even easier, our “Centrifugal Pump Maintenance: Winterization” video will help walk you through the process step-by-step. Watch it here: https://www.munropump.com/Resources/Videos