My name is Cody, I am new to the industry. I have been in a totally different cleaning business for 38 years and have the opportunity to change. For multiple reasons I have chosen to go with a portable unit. The info I need help with is, what is the normal PSI used for TG. 1200 and 1500 psi are the options in most portables. When using a spinner is it ever necessary to go to 1500 or will 1200 psi always work. I am concerned with energy loss using a spinner with 1200 psi that in some situations it may not be enough, possibly on concrete. I understand about chemical use and dwell time. Also how important is a solution tank system compared to just an auto fill. The system I am looking at is a Goliath from Steam Brite and it only has auto file, no tank. I have read hundreds of threads since I found this forum and greatly appreciate the volume of information I have gained from them. Thanks.