Point-of-entry remedy units are utilized the place water enters a house or commercial constructing and are installed to deal with the entire water used at that location. Chemical disinfection should not be relied on to provide water for ingestion when gross ranges of contamination or high levels of protozoans or turbidity may be current (e.g. uncooked sewage contamination). Under these circumstances, alternate sources must be used for any water to be ingested or used in food preparation. In cases where boiling water is not potential or sensible and alternate water sources are not available, chemical disinfection may be a viable substitute.