Sorry I've missed this thread--hoping that you're still around!

The orange is usually more indicative of iron than copper--do you have any iron content in your water? As far as I know, the copper is always either blue or green.

The shock isn't necessarily causing the nature 2 to stain the water, exactly...the nature 2 works by adding the minerals to the water, but the shocking is causing the minerals to precipitate out. That's the main reason we don't recommend that people use nature 2, because it causes problems like this. Metal sequestrants can be found at the pool store, not sure if you can get them at Lowe's, Home Depot, etc.. I'm not an expert on metals, but Marie and PoolDoc are, and they've recommended Jack's Metal Magic, Metal Out, etc.

Janet