SOLUTIONS
	Wastewater definitions At Grundfos, “wastewater” covers three categories: Drainage, effluent and sewage. Drainage Raw water, drainage and untreated wastewater containing solids no larger than 12 mm from households, farms and small industry. Effluent Dirty water and untreated wastewater (excluding toilet discharge) that contains fibres and solids.To avoid clogging, pumps allowing free passage of solids up to 35-45 mm are recommended. Sewage Untreated wastewater and raw sewage containing fibres, textiles and other solids, including toilet discharge from domestic sewage systems, farms and industry. The minimum free passage through the pump has to be at least 50 mm. To avoid clogging in commercial building, farms, industry etc. a free passage for solids up to 65-80 mm are recommended. Be aware that toilet discharge often contains foreign bodies such as nappies, tampons, toilet rolls, children's toys and toothbrushes.