A swirler includes a base and one or more fins coupled to the base. The swirler also includes a distribution member configured to divert or guide fluid. In some implementations, the distribution member includes an annular member coupled to the base and positioned at least partially around the longitudinal axis. The swirler may be included in an adsorption column.

A device for the filtration and purification of wastewater, such as grey water, aimed at providing a new clean and safe water source, comprising: a tank for collecting the water to be treated, comprising an inlet or opening for routing the water to be treated and for discharging the water once filtered and purified; a biocarrier container, placed inside the tank, comprising a plurality of biocarriers containing grown microorganisms, which purify the water; an aeration unit configured to supply oxygen inside the tank in order to promote the aerobic metabolism of the microorganisms and to prevent the appearance of bad odors; and a biocarrier for the growth of microorganisms for the filtration and purification of wastewater.