If you can capture and things like heavy metals or toxins, it's obviously going to be tiny amounts. Or - the amounts are the same but having a kg of cadmium in

If you can capture and things like heavy metals or toxins, it's obviously going to be tiny amounts. Or - the amounts are the same but having a kg of cadmium in a jar is obviously easier to handle than a kg of cadmium dissolved in 20 tons of water.