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When you pull the handle a washer is lifted and the water goes down into the toilet and at the same time the cistern fills up once the washer is back in place from the flushing mechanism
You use it to go number 1 or number 2 (sorry but I'm not gonna write it )then you flush and it goes down to the sewer.and if your not asking about that I'm sorry and listen to this.It flushes and it...
A cistern is usually an underground structure, but can be above ground which simply catches run-off water or rain water and keeps it until it is needed.