Duplex Sewage Systems
by Zoeller
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Customers who have purchased sewage systems have also been:
to single pump sewage systems by Zoeller -
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to PitPlus® sewage ejectors -
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to submersible effluent pumps
to float switches, sump pump alarms and "water detectives" -
to Drainosaur water removal systems -
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to Zoeller's Qwik Jon powerflush basement system -
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to multi-stage centrifugal pumps -
to many more quality products from Zoeller -
to pumps - index page
Low rates and easiest to calculate/understand shipping/handling for heavy Dual Sewage Systems
"What's the difference between 
Duplex systems contain two pumps and are mainly used when high volumes are needed.
The pumps will alternate while pumping low volumes and both pumps will work simultaneously to handle high volumes when needed.