# Filter output as input for the same filter

**URL:** https://discourse.itk.org/t/filter-output-as-input-for-the-same-filter/1464
**Category:** Algorithms
**Tags:** processing, filter
**Created:** [December 10, 2018, 9:06am UTC](https://discourse.itk.org/t/filter-output-as-input-for-the-same-filter/1464 "2018-12-10T09:06:07Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![fbudin](https://discourse.itk.org/user_avatar/discourse.itk.org/fbudin/32/14_2.png) [@fbudin](https://discourse.itk.org/u/fbudin)
#### Post date: [December 10, 2018, 2:41pm UTC](https://discourse.itk.org/t/filter-output-as-input-for-the-same-filter/1464/2 "2018-12-10T14:41:29Z")

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When you have a circular pipeline, you want to make sure that you disconnect the result. In general, if you don’t disconnect it, you will run into problems. In your case, you want to call `Add->Filter->DisconnectPipeline();` [1][2] after calling `Update()`.

[1] [How to \_really\_ disconnect pipeline?](https://discourse.itk.org/t/how-to-really-disconnect-pipeline/551)  
[2] [https://itk.org/pipermail/insight-users/2002-October/001368.html](https://itk.org/pipermail/insight-users/2002-October/001368.html)

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