Patients undergoing cardiopulmonary bypass surgery are treated perioperatively with methylol transfer agents, such as Taurolidine. A plurality of mapping tables in the SSD store data needed to create a one or more point in time snapshots and a current view of the SSD. A forward jetting-driving signal includes a plurality of forward pulse-waves that respectively rise up or fall down when the respective forward pulse-waiting-times have passed since the respective forward-timings. Some of the removal resilient elements may have a higher density or height than others.