JIWET is doing the next business, to achieve the purpose of establishment. １■ Research, development and also diffusion of the new technology regarding sewerage. ２■ Evaluation and also diffusion of new equipments regarding sewerage. ３■ Development and dissemination of the system of the design, cost estimation etc. regarding sewerage business. ４■ Collection, storage and distribution of the information regarding sewerage technology. ５■ Enforcement of the training regarding sewerage technology.