Pallets rot and leave nails behind a pallet has the spacing for a child to get his foot caught and not get out
Point in fact Juan Mendez died in July 2006 from drownig his foot was caught in the slats and could not reach the surface at Beetle lake. Granted the yong man was from the city no one told him that a man read somewhere that if you bundle pallets in the shape of a tee pee you will get more fish attracted to that spot.
We have had customers throw pallets in they got from warehouses that had absorbed chemicals and produced fish kills.
Use 12 inch concrete blocks or lay bags of sakrete on structure and fasten with zip ties when pond fills concrete cures.
rocks work well and never use sheetrock to anchor
