The invention relates to a pump arrangement, more particularly a magnetic clutch pump arrangement, comprising an inner chamber (11) formed by a pump housing (2) in the pump arrangement (1); a containment shell (10) which hermetically seals an enclosed chamber (12) with respect to the inner chamber (11) formed by the pump housing; an impeller shaft (13) that can be driven in rotation about an axis of rotation (A); an impeller (16) mounted on one end of the impeller shaft (13); an inner rotor (17) mounted on the other end of the impeller shaft (13); an auxiliary impeller (20) mounted in the chamber (12); and an outer rotor (26) which co-operates with the inner rotor (17). According to the invention the auxiliary impeller (20) is secured to the inner rotor (17).
