Hi, We routinely wash our donor blood,especially in all paediatric cases,we add  Heparinised Ringers solution for priminig the whole circuit and add albumin in it(5%) and circulate for 5-10mts,the we add the donor blood into the circuit and allow it to mix with the previous priming solution,then slowly we start  hemofiltration and remove the excess volume at the rate of 1:2, there by we try to reduce the potassium,glucose and lactate levels in the donor blood and then we add Bicarb and mannitol in the prime