The World Federation One Stop Fiqh

Ruling 174

If ground that is paved with stone or brick, or hard ground that does not absorb water, becomes impure, it can be purified with qalīl water; however, one must pour water over it to the extent that it flows. And if the water that is poured over it does not disappear down holes in the ground but instead gathers somewhere, then in order to purify that place, the gathered water must be removed with a cloth or a utensil.