A treatment device for the treatment of a metal article for treatment, wherein the treatment comprises at least pickling and phosphating of the article for treatment, wherein the treatment device comprises at least the following specified apparatus: a treatment container for receiving the article for treatment and for receiving a flowable treatment substance, a pump apparatus for circulating at least a proportion of the treatment substance and a filtration apparatus, wherein the treatment substance can flow around at least a portion of the article for treatment, in particular the entire article for treatment, wherein the treatment substance is a phosphorus-containing or phosphate-containing solution, wherein a swirling apparatus is provided to swirl up impurities depositing out of the treatment substance, in particular solid particles, wherein the swirling apparatus comprises at least one provision apparatus and a fluid conducting element having a plurality of outlet openings for supplying a swirling fluid to the treatment substance, wherein the swirling fluid can be supplied through the provision apparatus to the fluid conducting element at a pressure of more than 200 kPa (2 bar), wherein the fluid conducting element is formed by a plurality of conduit sections which can be uncoupled from each other by means of valve apparatus, wherein at least the majority of the conduit sections are disposed in the region of the floor of the treatment container, and wherein the treatment container is separated by a wall from a collecting chamber for collecting treatment substance which flows over the wall, wherein the treatment substance collected in the collecting chamber can be recycled to the treatment container by means of a conveyor conduit, wherein the pump apparatus and the filtration apparatus form a component of the conveyor conduit and the conveyed treatment substance is conveyed from the pump apparatus through the filtration apparatus, wherein the conveyor conduit is configured in a manner such that, because the treatment substance is conveyed back to the treatment container, an overflow can be produced to channel a portion of the treatment substance out of the treatment container and into the collecting chamber. a treatment container for receiving the article for treatment and for receiving a flowable treatment substance, a pump apparatus for circulating at least a proportion of the treatment substance and a filtration apparatus, wherein the treatment substance can flow around at least a portion of the article for treatment, in particular the entire article for treatment, wherein the treatment substance is a phosphorus-containing or phosphate-containing solution, wherein wherein the treatment substance can flow around at least a portion of the article for treatment, in particular the entire article for treatment, wherein the treatment substance is a phosphorus-containing or phosphate-containing solution, wherein a swirling apparatus is provided to swirl up impurities depositing out of the treatment substance, in particular solid particles, wherein the swirling apparatus comprises at least one provision apparatus and a fluid conducting element having a plurality of outlet openings for supplying a swirling fluid to the treatment substance, wherein the swirling fluid can be supplied through the provision apparatus to the fluid conducting element at a pressure of more than 200 kPa (2 bar), wherein the fluid conducting element is formed by a plurality of conduit sections which can be uncoupled from each other by means of valve apparatus, wherein at least the majority of the conduit sections are disposed in the region of the floor of the treatment container, and wherein the treatment container is separated by a wall from a collecting chamber for collecting treatment substance which flows over the wall, wherein the treatment substance collected in the collecting chamber can be recycled to the treatment container by means of a conveyor conduit, wherein the pump apparatus and the filtration apparatus form a component of the conveyor conduit and the conveyed treatment substance is conveyed from the pump apparatus through the filtration apparatus, wherein the conveyor conduit is configured in a manner such that, because the treatment substance is conveyed back to the treatment container, an overflow can be produced to channel a portion of the treatment substance out of the treatment container and into the collecting chamber.