ultrafiltration

This term is primarily used in technical, scientific, and industrial contexts, such as wastewater treatment, biotechnology, and medical dialysis. It describes a specific scale of filtration that is more restrictive than microfiltration but less restrictive than reverse osmosis, focusing on the removal of macromolecules and pathogens.

As a technical process name, it is treated as an uncountable noun. It refers to the method or the state of the process rather than a discrete object. Consequently, it does not have a plural form in standard professional usage.