From Pumps & Systems: Many designs of wastewater pumping systems are available. Each has features that make it the preferred choice for a given application. The system chosen is typically based on cost considerations, specific product features or familiarity with the equipment and supplier.
Submersible pumps and systems have become a popular choice through the years because of their ability to handle solids and operate under water and their flood-proof feature and single-basin design.
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Grinder Pump Tutorial