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You may want to seal the inside walls and floor and outside of foundation so the porosity of the cinderblock for moisture travel is reduced significantly. If the basement is prone to flooding in heavy rain /high water table conditions a french drain (slotted pipe on gravel) around the inside perimeter under the slab is the way to go.... ideally with gravity feed outflow or sump pump if required. We did all of the above to our 1st house and it made the basement very liveable... I had an office down there and the dehumifier was only necessary during the most humid weather
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