Interceptor drip trays are the only proven system available which allow rainwater to pass through whilst safely securing retained oil, fuel and other chemicals. Their highly effective design negates the need for filters or chemicals, giving you environmental protection throughout a project. Working on the principle that oil floats on water, the tray naturally separates the two by allowing the water to pass safely through the outlet hole. Even if pumps have a built-in interceptor drip tray, an additional full-length tray will give extra protection. Environmental authorities often insist on using these whilst working near waterways or when there is a risk of polluting groundwater. The amount of oil and fuel retained in the tray is monitored by a gauge and, when full, the residue can be removed by a licensed disposal company.