An arrangement (1) for dairy applications, for dosing cleaning agent into a fluid. The arrangement (1) comprises a fluid circuit (31), a diaphragm pump (3) arranged to provide a flow of cleaning agent in the fluid circuit (31) from a cleaning agent source (4) and a dosing valve (5) arranged to the fluid circuit (31) downstream the diaphragm pump (3). The dosing valve (5) is configured to regulate a dosage of cleaning agent from the diaphragm pump (3) to a collection container (25). The arrangement (1) further comprises a control arrangement (20) configured to control the dosing valve (5) to regulate the dosage, such that a dosed volume of cleaning agent passed to the collection container (25) is correlated with a volume of fluid being passed to the collection container (25), in order to obtain a target concentration of cleaning agent in the fluid in the collection container (25). The disclosure also relates to a method for dosing cleaning agent into a fluid.