---
title: Michigan DOT Publishes Jet Filter Test Results with AASHTO-APEL
description: Michigan DOT publishes demonstration test results from a 2-year study of Maintainable Weep Hole Filters by Jet Filter System
---

[Jet Filter Blog](https://blog.jetfiltersystem.com)

# [Michigan DOT Publishes Jet Filter Test Results with AASHTO-APEL](https://blog.jetfiltersystem.com/mdot-apel-announcement)

 Written by [David Heilman](https://blog.jetfiltersystem.com/author/david-heilman) | Aug 24, 2021 8:36:23 PM

Michigan DOT and Jet Filter System completed a successful 2 year product demonstration of Maintainable Weep Hole Filters. These results are now published on the AASHTO Product Evaluation List under [DOT Evaluated Products](https://apel.transportation.org/DotEvaluated/ViewProduct/?id=589). 

[AASHTO](http://Transportation.org) stands for American Association of State Highway and Transportation Officials. The organization provides guidance and standards for construction products for America's transportation infrastructure.

Every year, new products are developed to improve roads and bridges, reduce construction costs and provide longer service life.

Michigan DOT & Jet Filter Systems installed 52 weep hole filters into the exterior walls of a twin barrel box culvert running under US-31 along the Macatawa North Branch. The demonstration project tested multiple filter sizes, configurations and filter fabrics. Based on the results, Michigan DOT published a state-wide [special provision](https://mdotjboss.state.mi.us/SpecProv/getDocumentById.htm?docGuid=4bf8e6ce-77bc-4281-bfe6-f04f0b589fc8&fileName=%22Maintainable%20Drain,%20Steel,%20__%20inch-12TM717(A415)-11-01-19.rtf%22) allowing for the use of Maintainable Weep Hole Filters on any new or existing retaining wall.

The Maintainable Weep Hole Filter by [Jet Filter System](http://www.jetfiltersystem.com) is a  breakthrough technology that transforms retaining wall drainage and extends the life of any new or existing wall.

**Extend the life of your wall** to preserve your investment! Contact us today for more information: 1-800-475-2029 or [info@jetfiltersystem.com](mailto:info@jetfiltersystem.com).

 

[View full post](https://blog.jetfiltersystem.com/mdot-apel-announcement)

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