SEWAGE PUMPS are automatic pumps used when liquid being pumped contains solids up to 2 in. diameter. EFFLUENT Pumps are automatic also, but recommended for applications when liquid being pumped contains solids up to 1/2 in. Pumping waste from a bathroom to a sewer or septic line is a common application and Sewage Pumps are recommended. Effluent pumps are more specific to applications, and can even be used in Sump Pits that see alot of debris. We have many varieties to choose from, which differ in construction materials, performance specs, and system availability.