# Bubbles in Pump Tubing

**URL:** <https://forum.fudiabetes.org/t/bubbles-in-pump-tubing/12589>\
**Category:** Type 1 & LADA\
**Created:** [April 9, 2022, 11:04pm UTC](https://forum.fudiabetes.org/t/bubbles-in-pump-tubing/12589 "2022-04-09T23:04:35Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Eric](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/eric/32/9209_2.png) [@Eric](https://forum.fudiabetes.org/u/Eric)\
**Post date:** [April 10, 2022, 4:49pm UTC](https://forum.fudiabetes.org/t/bubbles-in-pump-tubing/12589/9 "2022-04-10T16:49:00Z")

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Hey @bkh,  
If you want to get super fancy you can try keeping your vial at negative pressure. That reduces the amount of air dissolved in the insulin.

I’ve been doing my vials like this for a while. It’s pretty easy to do. Basically you just always take out more insulin than the amount of air you put into the vial.

Here is a reference thread:

> [@Filling pump from insulin vial - negative pressure trick](https://forum.fudiabetes.org/t/filling-pump-from-insulin-vial-negative-pressure-trick/8901):
>
> This topic came up on an OmniPod thread, but it can benefit any pump user, so I am putting it in its own thread… Any liquid contains gases dissolved in it. So for example, if you put 1ml (100 units) of insulin in your pump, a very small amount of the volume you are putting in is not insulin, it is just dissolved gas. William Henry was a 19th century English chemist. Henry’s law states: The amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. [image] …

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