Naptha can be re-used but the higher the temperature of the naptha, the more oils it will pick up. (Yellow N-N-DMT-oxide being one of them)

So if the naptha is boiling it will tend to clog up and become saturated, warm naptha however will not only take mostly the white N-N-DMT but will be much more re-usable, almost clear after precipitation.

SWIM has re-used naptha several times, as long as it is kept warm (not cold OR hot) then it will be best.

Peace and Love!