# filtering feature table

**URL:** https://forum.qiime2.org/t/filtering-feature-table/15732
**Category:** General Discussion
**Created:** [July 15, 2020, 5:13am UTC](https://forum.qiime2.org/t/filtering-feature-table/15732 "2020-07-15T05:13:47Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Nisha](https://forum.qiime2.org/user_avatar/forum.qiime2.org/nisha/32/11057_2.png) [@Nisha](https://forum.qiime2.org/u/Nisha)
#### Post date: [July 15, 2020, 5:13am UTC](https://forum.qiime2.org/t/filtering-feature-table/15732/1 "2020-07-15T05:13:47Z")

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Hi

I am analyzing v3-v5 region of 16S rRNA. while filtering my feature table for mit/chl contaminants I found no difference between table before and after filtering. that clearly suggests that there were no mit/chl DNA sequences.

After that I picked up V3-V4 region from the same dataset, and there I found the difference in feature table. before filtering number of features were 15025 and after it reduced to 15014.  
Is it possible that in v3-v5, there were no contaminants detected and v3-v4 I got few?  
if yes! how?

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### Author: ![system](https://forum-qiime2-org.s3.dualstack.us-west-2.amazonaws.com/original/3X/2/1/21af5fe23cb6f4579467c66a9ed94e55274ca7bd.svg) [@system](https://forum.qiime2.org/u/system)
#### Post date: [August 15, 2020, 11:25am UTC](https://forum.qiime2.org/t/filtering-feature-table/15732/2 "2020-08-15T11:25:19Z")

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