well ive taken some to a deli / butcher and hes sold some dirt included, so i assume regs dont apply to ducks. ive seen really clean duck eggs and i bet they are some sort of shed bird not like mine that live outside all day night with stream to use, mud to root around in for crawley stuff, just penned up nightly and let out about 9 am so i dont have to go on an egg nest hunt every day, they all lay before 9am..... impossible to get mine to lay on clean straw, they do for a while then swop places, once one swops they all seem to swop....ive tried supermarket clean ducks eggs... no comparison,...a bit of dirt = quality yokes, mine stick to the roof of my mouth in an egg sandwich ( have to eat these over the sink),....its the same with veg now lettuces etc that have never seen dirt just running water with additives... we will have to buy a jar of dirt soon to get the minerals we need. so carrying on till eu buggers it up.... harry