The Waste Sequestration Well is a place for your empire to store it's waste. Waste that is not stored turns into pollution and lowers your empire's happiness. The higher the building level the more waste can be stored.
Waste that you produce but cannot store creates pollution on your planet, which will reduce happiness.
This building is a requirement in order to be able to build Scows. Level 10 unlocks the basic Scow. The Mega Scow is unlocked at level 30.
Keywords: Storage Buildings Waste Buildings