Many human activities can causes water to become polluted. Once water is polluted it's difficult to clean up. Which is the most difficult water source to clean up?

Answer 1

The oceans are the most difficult to clean up. The reason is a simple one; they are huge, and are deep. Cleaning up the oceans is nigh on impossible. The key is to halt the pollution. As just one example of the breadth of ocean pollution, consider the North Pacific gyre. It is a slow "whirlpool" larger than several states put together. Trapped in this circling patch of water there are millions of tons of plastic and other debris floating around. Use the link below to check it out. There are millions of tons of garbage (urban refuse) dumped into the oceans daily. Additionally, there is a constant stream of chemical and other pollution being pumped in every second via river systems. Even with "front line" water treatment plants like the U.S. has, it's a struggle. There are a lot of places that still have no water treatment. It's not a national problem. It's global. We've got our work cut out for us. Underground water in aquifers is no picnic to clean up either. The water is in channels snd cracks in the rock with unknown flow patterns. To remove the contamination you have to drill down to the proper rock layer and suck out enough water at just the right speed to coax the flow to you collection point. Too much and you're draining the aquifer and too little and the pollution is not affected.