Silage tanks are manufactured in the same sizes as cesspools but are used for the storage of more toxic/harmful or chemical waste. Silage tanks are manufactured using special resins designed to be resistant to aggressive silage effluent and to comply with all statutory regulations.
Silage effluent has the potential to cause severe environmental damage if allowed to enter a watercourse as it has a very high BOD (Biochemical Oxygen Demand), up to 200 times greater than that of domestic sewage. Therefore, if it enters a watercourse it can very quickly remove all the oxygen and kill off all aquatic life within the ecosystem.
Silage tanks are often used for touring caravan sites to collect and hold the elsan waste.