The issue of microbead pollution from makeup and hygiene products has become well-known for its destruction and negative impact on various waterways and marine life, despite its small size. However, more recent discoveries have brought to light that there is an even more widespread and impactful problem polluting our waterways that we cannot see. A study commissioned by Patagonia and executed by graduate students at the University of California, Santa Barbara suggests that as a result from home laundering anywhere between 64,000 and 750,000 lbs of microfibers are ending up in natural waterways in the United States alone (3). In an effort to help solve the microfiber pollution problem, a lifecycle systems thinking approach was taken to identify the most optimal point of intervention. Through this analysis, municipal wastewater treatment plants were identified as the most favorable point of intervention within the post-consumer use phase of a garment's lifecycle. Within the system of a wastewater treatment plant, the area of ideal implementation was established: post-disinfection and pre-effluent discharge to the receiving body of water. A biomimetic design approach was applied to ideate a design recommendation in the pursuit of mitigating the spread of microfiber pollution, specifically around the filtering out of microfibers and small waste particles. Of all of the organisms explored, the giant oceanic manta ray proved to be the most interesting and feasible organism for which to create an initial design solution due to its unique combination of form, function and scale. This thesis work develops a rough design idea for microfiber filtration at the wastewater treatment level inspired by the manta ray and also discusses potential next steps including proposals for how next to evaluate, test and validate the design idea.