I would like to clarify something. If someone walks on carpet with slippers that are worn in the toilet, then what if someone walks on that same carpet barefooted while his feet are wet?
الجواب حامدا و مصلیا
If there is no apparent impurity on the slippers worn in the toilet, then wearing these slippers on carpet will not make the carpet impure. For this reason, walking barefooted on such carpet with wet feet will not make one’s feet impure. However, it is more precautious to wash one’s feet before performing Salah after walking on such carpet with wet feet.