Tingvall is an eco-conference centre that was built with support from the European Union. It is nearly self-sufficient with energy (solar, wind, wood) and is built using only eco-friendly materials. Tingvall has urine diversion single flush toilets (see also urine diversion flush toilet). The faeces are collected below the toilet for composting and a neighbouring farmer collects the urine (see also reuse of urine and faeces in agriculture). The greywater is treated in a pond system prior to discharge to a local stream (see also waste stabilisation ponds, aerated ponds, and advanced integrated ponds).