Best Low-Cost Field Method for Tracking Microplastic Load in Local Rivers?

Hello everyone,I'm working on a small, independent study related to the EFFUSE project's goal of monitoring local river quality. I'm specifically interested in the issue of microplastic contamination in tributaries around Košice.Since my resources are limited, I am looking for advice on the most reliable, low-cost field sampling and initial filtration methods for microplastics (ideally down to 300 $\mu\text{m}$ or smaller).Has anyone had success using DIY or modified commercial equipment (like plankton nets with specific mesh sizes, or cost-effective filtration setups) for collecting samples before lab analysis? Any practical tips on avoiding contamination during the field collection phase would be highly appreciated!Thanks in advance for your expertise.
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