In wastewater treatment plants a high amount solid waste, even of large size, tends to build up inside the collection tanks, potentially blocking the impeller and clogging up the pipes making the lifting station almost ineffective.
The use of filtering grids is not an effective solution because, in the presence of heavily loaded water, constant monitoring and frequent removal of the collected solid waste is needed.
The different nature of the waste present, which is fibrous but also contains plastic and metal, does not allow the use of normal shredding pumps because of their small free passage.