Industry FAQ

Q: What is the difference between a sump pump and a sewage pump, and why can’t I simply use a sump pump in a basement sewage application?

A: Sump pumps are designed to handle clear water infiltration, like groundwater. Their impellers are designed for low viscosity fluids and cannot effectively process solids. Sewage pumps have robust impellers designed to macerate or pass solids, preventing clogging and ensuring reliable operation with wastewater containing fecal matter, toilet paper, and other debris. Using a sump pump for sewage will almost certainly result in immediate clogging and pump failure, potentially causing a sewage backup.

Q: What size pump do I need for my basement, and how is Total Dynamic Head calculated?

A: Pump sizing depends on several factors, including the distance the wastewater needs to be lifted (Total Dynamic Head – TDH), the flow rate required, and the size of the plumbing fixtures served. TDH is calculated by adding the vertical distance from the pump to the discharge point, plus the friction loss in the piping (which depends on pipe diameter, length, and flow velocity). A qualified plumbing engineer should perform these calculations to ensure proper pump selection.

Q: What is a check valve, and why is it important in a sewage pump system?

A: A check valve is a one-way valve installed in the discharge piping to prevent backflow of wastewater into the pump basin when the pump shuts off. This prevents the pump from having to “re-lift” the water, reducing stress on the motor and extending pump lifespan. It also prevents potential contamination of the basement floor.

Q: How often should I replace my sewage pump, and what are the warning signs that it’s failing?

A: The typical lifespan of a sewage pump is 7-10 years, depending on usage and maintenance. Warning signs of failure include excessive noise, reduced flow rate, frequent cycling (short-cycling), and alarm activation. A burnt electrical smell is also a critical indicator of impending failure. Regular inspection and preventative maintenance can extend the pump’s lifespan.

Q: What are the advantages and disadvantages of submersible vs. pedestal sewage pumps?

A: Submersible pumps are quieter, more efficient, and less prone to freezing. However, they require removal of the entire unit for maintenance. Pedestal pumps are easier to service, as the motor is located above the basin, but they are noisier and more susceptible to freezing. The choice depends on the specific application and local climate.