To keep the water clean, the containing pools are built of steel and brick, and have their bottoms covered with a 5 cm. layer of gravel. This gravel collects dirt and provides a place for the eels to burrow in winter. Ponds are cleaned, fumigated and aired once a year, and have a constant flow of water.
一旦發現鰻池面積過多，則可運用農地管理條例、農地變更使用辦法等，限制養鰻場的盲目擴張。