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What happens is this

power off on pump: you fill tank to its full hieght, then you fill sump up a little past top of pump

turn pump on: water is poured into the tank via pump from sump, water then overflows into the dam section and is drained into the sump,

so basically its a continous trading of water back and forth, but continuous

a sump is a holding chamber, basically another tank, where people put heaters, skimmers, wet-drys, chemcial filtration, auto-water changers, etc etc
 
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