When the foundation began offering programs in the 1980s, three composting toilets were built by volunteers. They have standard toilet seats, and one even offers a splendid eastern view of the lake. Rather than flushing after use, guests simply dump a large cup of sawdust down the hole. At the end of their week-long stay, those who want the complete Mallard experience help out with a little shoveling to facilitate the composting process. The compost is rendered inert over time, and it becomes safe for distribution as island soil.