> For the complete documentation index, see [llms.txt](https://docs.cascade.io/cascade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cascade.io/cascade/cascade-faqs/functions-and-expressions/how-to-remove-null-records-with-a-filter-tool.md).

# How to Remove null Records with a Filter tool

Remove null records with a Filter tool

To remove null records from a dataset with a [Filter](/cascade/tools/transform/filter.md) tool, we recommend using the [ISNULL()](/cascade/functions-and-expressions/functions/logical/isnull.md) function.

<figure><img src="https://2577551913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MW_FvcY52Jcyt8JHFGs%2Fuploads%2FroarldJCYQA1ZPnaRHNm%2Ffilter%20tool%20configuration%20with%20isnull%20function.png?alt=media&amp;token=e30e77df-2b3a-49e1-adbe-df18740739b5" alt=""><figcaption><p><a href="/cascade/tools/transform/filter.md">Filter</a> tool configuration with an <a href="/cascade/functions-and-expressions/functions/logical/isnull.md">ISNULL()</a>is null function</p></figcaption></figure>