The Dutch do it quite some time as well. Video (in Dutch, but intersting to see) https://www.rtvnoord.nl/video/863704/mosselmonitor-gaat-gronings-water-testen

The Dutch do it quite some time as well. Video (in Dutch, but intersting to see) https://www.rtvnoord.nl/video/863704/mosselmonitor-gaat-gronings-water-testen https://www.rtvnoord.nl/video/863704/mosselmonitor-gaat-gron...