> For the complete documentation index, see [llms.txt](https://khalil-lab.gitbook.io/evolver/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://khalil-lab.gitbook.io/evolver/extensions/custom-fluidics/running-the-slow-pumps.md).

# Running the slow pumps

The slow pumps are currently operated independently of the main eVOLVER GUI and pump liquid at a rate of X mL/min.

The eVOLVER slow pumps currently operate exclusively through the [command line](/evolver/guides/command-line-usage.md). The navigate to the `run_slow_pumps.py` file similarly to starting an experiment via command line.

In the run\_slow\_pumps.py script you only need to modify one of two lines for time settings, one for modifying specific pumps and the other for modifying all pumps

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2FLpavLFBt2hLvcakAhyTP%2FScreenshot%202024-08-28%20at%204.11.57%20PM.png?alt=media&amp;token=7d670e5f-d2af-4982-8d53-481732b727fa" alt=""><figcaption><p>Modify specific pumps timing</p></figcaption></figure>

<figure><img src="https://3394537773-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYy5AdmKzUTn7D8n357Md%2Fuploads%2FgCLMN0mrlaxfTzIh5e9f%2FScreenshot%202024-08-28%20at%204.10.16%20PM.png?alt=media&amp;token=14615c54-c4bf-47fc-8bc3-611c487512b9" alt=""><figcaption><p>Modify all pumps timing</p></figcaption></figure>

Traditionally it takes about 200-300 seconds to fill the lines with liquid using the slow pumps, however this is dependent on the length of tubing.