A randomised controlled pilot trial is proposed. The trial is designed to build upon routine education about fluid control during dialysis visits, and will compare a group of patients who have received an intervention to boost their sense-of-self (self-affirmation arm) to a control group (control arm). Patients in the self-affirmation arm should have a more positive evaluation of the health-risk information about fluid management, feel more able to, and intend to change their fluid control behaviour, and subsequently have lower interdialytic weight gain.