Eco-friendly Mini Vacuum Cleaners

Current wastewater treatment plants don't remove all the drug, pesticide and industrial chemical contaminants, before discharge. It's been suggested that a tiny, freshwater crustacean could do the final clean. Daphnia or 'Water fleas' filter out (like little vacuum cleaners) wastewater contaminants (https://www.theguardian.com/environment/2023/sep/26/scientists-use-water-fleas-to-filter-pollutants-out-of-wastewater). It's suggested that Water fleas could provide an ecofriendly, low cost solution for wastewater purification. Daphnia could also be especially useful, in filtering out microplastics. These organisms could, of course, only be used to treat freshwater. There are, however, many marine filter feeders that might be used in a similar way for salt water.