In order to remove smaller solutes such as endotoxins which filter should be utilized?

To remove smaller solutes such as endotoxins, a 0.22-micron filter or an ultrafiltration membrane should be utilized. These filters are effective in retaining larger particles while allowing smaller molecules and contaminants to pass through. Additionally, endotoxins can be effectively removed using specialized filtration systems designed for this purpose, such as endotoxin-retentive filters.