OK.... I think we are on to something here. I did some more research and it turns out that blue shale is blue clay. Thanks for helping me unravel this mystery!

So my goal is to build a pond for LMB fishing..... With that goal in mind, what are the benefits of lining the bottom with blue clay? I’m looking of the pros/cons to determine if the added cost will be worth it.

Water clarity: Is there a benefit to clearer water? Would I get more plankton growth due to the sunlight penetrating deeper? More O2? Or will it just allow more weeds to grow deeper along the sides?

Why do pond builders call it gold bullion? Is it as good as gold or cost as much? ;-)


Thanks for sticking with me on this one!