Abstract The Oven Element Guard concept of net ultrafiltration (UFNET) mentioned in the paper by Murugan et al.in a recent issue of Critical Care does not equate to the real UFNET in patients with renal replacement therapy initiation.Furthermore, the baseline blood pressure among the groups Soccer - Goalie - Clothing had a statistically significant difference.Both of these two factors may affect the final results.Thus, we should be cautious interpreting the conclusions.