Dialysis machines comprising a feed arrangement (170) to supply a dialysis fluid to a dialyzer (150) during dialysis treatment and a return arrangement (171) to remove the dialysis fluid from the dialyzer during dialysis treatment and forward it to an exit (129); a feed recirculation circuit (172) to allow a fluid of the feed arrangement to be re-circulated in a fluid loop path comprising, at least a portion of, the feed arrangement and the feed recirculation circuit and a return recirculation circuit (173) to allow a fluid of the return arrangement to re-circulate in an auxiliary fluid loop path comprising, at least a portion of, the return arrangement and the return recirculation circuit. A controller (160) configured to perform disinfection by re-circulating a disinfectant and/or a heated fluid through said fluid loop path and/or through said auxiliary fluid loop path. The dialysis machine (1) further comprises a feed forward arrangement (172) connected to the fluid loop path and arranged to enable a fluid of the feed arrangement (170) to be forwarded to the exit (129) by-passing the auxiliary fluid loop path.