Yup I collect from a very brown / dark green looking ocean in Northern Australia (the part where you can't swim in the ocean because of crocodiles, tiger sharks, box jelly fish, stone fish, blue ringed octopus, cone snails and irukandji). And as I collect from the shore it is fairly turbulent water where there is lots of sediment and crud etc. But strain it through a filter sock and it's crystal clear and it makes everything in the tank very happy.I collect NSW from the South China Sea. As crazy as it sounds, the water is actually really nice. Never had a fish die from parasites. I don’t even QT fish. They live as they would in the ocean.