Hippo’s main diet is mostly Hay.
This solid (lignin) is mainly released in the exhibit pond where it spends the day, and stored in the Wastewater holding tank.
Previously, Zoo staff used to enter and use shovels & back hoe machine to remove the accumulated solids (lignin) that did not degrade.
Due to the daily fermentative activity of the EM® microbes on the solid waste, it has almost eliminated the need to enter and clean any
solids from the holding tank.