The start up settings from the supplier should be looked at as only a starting point. Your results may vary. For instanse, if you are close to the water plant and your water pressure is high, say around 60 to 80 psi, your hydrominders will suck much more than if your incoming pressure is 20 to 30 psi. Your pressure will also vary during the day. And the diaphrams in the hydrominders should be changed about every two years. That can make a big difference. And lastly, most soap salesmen are just that, soap salesmen. Most are clueless about the things I mentioned.