Does it matter if the pallets are in constant shade? I built a really big dock and could put them under there. You see I don't have much area in the pond where the sides aren't very steep and I'm 15' deep in most areas. There is room under the deck to put a few piles of pallets that come within a foot of the surface of the water.

If shade doesn't matter, I plan on having two pallet piles (spaced for more room), a good sized tire bundle chained together and possibly some bowling balls with PVC loops that mimic atoms in chemistry!

FYI I hit 100 inches deep Jan 2nd so that's a cool number. Also, all the above "structure" could easily be removed if something needed sealed in the future. I want to stay away from giant root balls or tree tops if I can incase they need removed.

Happy New Year Guys, I really appreciate all the help and suggestions