I followed all instructions and previous suggestions to test each of the buttons with colored water, everything was fine, no leaking. I primed the 3 buttons all the same. Product worked fine for 2 weeks, then one of the buttons started acting funny and I had to push it 15 times to get enough shampoo (far left button). I checked and nothing was clogging it up, so now I have to wait until I use up the conditioner and shower gel before I can take it down to empty the shampoo and see what's wrong. Frustrating.