Could someone please tell me how important a regulator is w/ solenoid valve and rain system. I just got an autopilot master controller and was trying to save money on the regulator however from what I have read i should not skimp on this. http://www.amazon.com/Titan-Controls-702710-Regulator-Controllers/dp/B004MUDNKS/ref=sr_1_10?ie=UTF8&qid=1392372129&sr=8-10&keywords=co2+regulator how do this one look? I have heard sentinel is a good brand and mixed reviews regarding hydrofarm regulators. Can someone help please. I am a little confused regarding these products and how regulators work.