With Prolong Concentrate you get to determine the measurements! That means you can fill 5 foam pumps with 1 Prolong 100ml concentrate or as many as 20 foam bottles !!
To make 20 bottles add 3-4 squeezes of the Prolong concentrate into an empty foam bottle. Fill the remainder of the bottle with Distilled water. (Make sure you leave space at the top for when you add the foam pump!!) If you want a thicker foam consistency just add more concentrate.