What does the diaphragm do in pool cleaner?
What does the diaphragm do in pool cleaner? The diaphragm is what creates the suction and release action in your pool cleaner (if you look at the cleaner while it’s operating, it looks like it’s doing tiny jumps on your pool surface). It works very much like a heart valve, it builds pressure, then releases it, builds pressure, releases it and so on.