I saw on other sites the common ratio is 1:4.It will also depend on how soft your water is. I dilute my soap with boiled (cooled) water, or filtered (this way i hope i get a 'cleaner' soap). Also, when i noticed that my foam dispenser was not pumping well or hardly, i almost threw it away. But then i just decided to open up the bottle, remove the tube (it's easily removable) from the main 'mechanism' (for the luck of a better word), and wash it well. I think, in my case, the pumping was suffering not because of soap build-up, as i suspected originally, but because somehow the water got collected inside the pump and affected the pumping. At first i didn't know how to get rid of the water (i couldn't open the pump further), then i just turned the pump upside down and tried to pump it empty. It worked! The water came out and when put all part back together, my foam dispenser was good as new!
Also, when i noticed that my foam dispenser was not pumping well or hardly, i almost threw it away. But then i just decided to open up the bottle, remove the tube (it's easily removable) from the main 'mechanism' (for the luck of a better word), and wash it well. I think, in my case, the pumping was suffering not because of soap build-up, as i suspected originally, but because somehow the water got collected inside the pump and affected the pumping. At first i didn't know how to get rid of the water (i couldn't open the pump further), then i just turned the pump upside down and tried to pump it empty. It worked! The water came out and when put all part back together, my foam dispenser was good as new!