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title: FAQ's | Knowledge Base
description: Frequently asked questions
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2. [FAQ's](https://support.farmchem.com/knowledge-base/faqs)

# FAQ's

 Frequently asked questions

## DEF FAQ's

- [Can I use my chemical or fertilizer pump to pump DEF?](https://support.farmchem.com/knowledge-base/can-i-use-my-chemical-or-fertilizer-pump-to-pump-def)
- [Can I use a rinsed chemical or fertilizer tanks to store DEF?](https://support.farmchem.com/knowledge-base/can-i-use-a-rinsed-chemical-or-fertilizer-tanks-to-store-def)
- [Do I need to have containment or a dike for my Bulk DEF Tank?](https://support.farmchem.com/knowledge-base/do-i-need-to-have-containment-or-a-dike-for-my-bulk-def-tank)
- [Are DEF bulk tanks plastic or steel?](https://support.farmchem.com/knowledge-base/are-def-bulk-tanks-plastic-or-steel)
- [Is DEF hazardous or regulated?](https://support.farmchem.com/knowledge-base/is-def-hazardous-or-regulated)
- [Why do I need a Closed Filling System?](https://support.farmchem.com/knowledge-base/why-do-i-need-a-closed-filling-system)
- [Can I put my tank outside?](https://support.farmchem.com/knowledge-base/can-i-put-my-tank-outside)
- [Do I need to winterize my pump to prevent the DEF from freezing and cracking the pump?](https://support.farmchem.com/knowledge-base/do-i-need-to-winterize-my-pump-to-prevent-the-def-from-freezing-and-cracking-the-pump)

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## Chem FAQ's

- [Open vs. Closed Hydraulic Centers](https://support.farmchem.com/knowledge-base/open-vs.-closed-hydraulic-centers)
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