Winter storage of the inoculant applicator
Winter storage of the inoculant applicator is an essential step to prevent breakdowns, leaks and start-up problems in the spring. By properly preparing the pump and system before the deep freeze, you protect the seals, diaphragms and hoses against freezing and drying out. You can compare this procedure to closing a swimming pool.
Here’s the recommended procedure for winter storage of the applicator.
Why properly store your inoculant applicator before winter?
A pump left with product residues or without protective fluid can freeze, crack or have its seals deteriorate. A few minutes of preparation can help you avoid costly repairs and get back up and running quickly in the spring.
Winter storage steps for the applicator
- Thoroughly rinse and drain the pump
Carefully rinse the entire system to remove product residues. Then completely drain the pump and hoses. This step is crucial to prevent deposits from building up or freezing inside. - Circulate –40 °C windshield washer fluid
Circulate –40 °C windshield washer fluid through the entire circuit (pump, hoses and suction tube). The –40 °C washer fluid effectively protects against freezing and lubricates the internal components. - Store the pump with fluid inside
Leave fluid in the pump for the entire storage period. You can use –40 °C windshield washer fluid or plumbing antifreeze. Never leave the pump dry: the fluid prevents the seals from drying out and provides extra protection against freezing.

Additional tips for the cold season
- Store the applicator in a location sheltered from the elements and extreme temperature swings if possible.
- Make sure all fittings are properly closed before putting the equipment away.
- In the spring, drain the protective fluid and rinse the system before the first use.
By following these winter storage recommendations for the inoculant applicator, you help ensure the longevity of your equipment and a trouble-free restart in the spring.
Questions or need support? Contact your Uniag expert-advisor. They can guide you based on your situation.
Frequently asked questions about storing the inoculant applicator
What fluid should I use to protect the pump over winter?
-40 °C windshield washer fluid or plumbing antifreeze. Both options are recommended for winter storage of the inoculant applicator pump.
Do I need to completely drain the system before adding the protective fluid?
Yes. It is important to rinse and drain thoroughly first to remove product residues, then circulate and leave the protective fluid inside.
When should I do the winter storage?
Ideally before the first hard frosts, as soon as you stop using the applicator for the season.