Although scientific progress has shown the harmfulness and toxicity to man and the environment of certain pesticides, prohibiting their use, the residues of old productions can still give rise to environmental problems with very significant impacts. Among these, the case of DNAPL is certainly of interest, because these substances, by virtue of their specific weight, can migrate deep into the soil, reaching the bottom of the aquifer and accumulating at high depth, giving rise to contaminations difficult to be addressed. The presence of these substances determines the slow dissolution in the groundwater of compounds that can cause damage to humans and to the ecosystem.