Small animals (water lices, Asellus aquaticus) in drinking water networks – occurrence and evaluation
In drinking water distribution networks, a significant number of small animals (invertebrates) up to a mass development can occur. Besides not visible protozoan (amoebas) and small metazoan (nematodes, copepods, water flies), visible macro-invertebrates such as water lice, oligochaetes and chironomids are common. These macro-invertebrates lead to an aesthetic impact on drinking water supply and a hygienic impact is caused by faeces of the animals as well as by dead animals.
The observation of small animals (invertebrates) in drinking water networks leads to a spontaneous rejection of the product `drinking water´. But some facts should be considered:
New methods for analysis and treatment of drinking water networks have been developed: