Containing device for a treatment machine, in particular for washing and/or sterilizing loose products, comprising a plurality of containing elements (16) for the loose products and at least a first hydraulic circuit (15) to feed at least a treatment fluid into said containing elements (16); said first hydraulic circuit (15) is fluidically connected to delivery means (41, 42, 43, 44) of the treatment fluid to the containing elements (16); the delivery means (41, 42, 43, 44) of the treatment fluid are configured to deliver the treatment fluid on the surface of the containing elements (16) in at least one direction (U) suitable to create a swirling and turbulent motion in the treatment fluid, so as to substantially keep the loose products contained in said containing elements (16) in suspension and moving in the treatment fluid.
