Bubble Bath?

The Netherland's Coast Busters organisation appears to have had some success with bubble barriers (https://www.theguardian.com/environment/2022/aug/05/incredibly-promising-bubble-barrier-extracts-plastic-from-netherlands-river). Coast Busters recognised that most of the plastic waste on some Dutch beaches, rather than being brought in by the tides, was carried there by nearby rivers and canals. The organisation trialed placing a tube along the bed of the entire width of the waterway. At regular intervals, the tube was perforated by small holes. This meant that, when air was pumped though the device, a 'curtain' of bubbles was created. The resulting 'bubble barrier' appeared to be very effective in bringing plastic waste to the surface, where it could be removed. Seems like a nifty idea.