I have a question concerning the selection of a sewage pump or grinder pump for an application that requires pumping of effluent through a 1700 foot, 2 inch diameter line with no elevation. The sewage is from two toilets directly and other sources ( four hand sinks, one three compartment sink )through a grease trap. The peak expected sewage flow is 20 GPM. Will a sewage pump be adequate for this job or should I go for the mor expensive grinder pump?