I have 2938 but it's an old card and it may have changed. Try the other numbers. If you get a new cell number for Juan Pablo, please post it. T.I.A
Cistern water is sucked from the bottom by either an above ground or submersible pump. As I have already stated, I had professionals come in to do the work and, all in ONE day, they drained it, cleaned it, PARGED it and filled it. Concrete does not have to be air cured for days before getting wet.
Pouring Foundations Under Water (indianapublicmedia.org)
Does Concrete Cure if Standing in Water? (sfgate.com)