“Diffusion is by far the most important process involved in the transport of electrolytes and solutes in peritoneal dialysis (PD). Examples of such solutes include: Urea, Creatinine, K⁺, H⁺, HCO3^–, Phosphate, Albumin, proteins and toxins^3,7. Diffusive transport of Na⁺ and Ca²⁺ is minimal.”

Advanced Renal Education (advancedrenaleducation.com)