I have a new hot tub and I have filled it but I am concerned that it is too full. I picked it up on Craigslist and, of course, the associated manuals were not available. Can anyone tell me where the "full line" is on this hot tub? Currently, I am full above the skimmer but there is water leaking from the line below the big round air blower adjustment knob. Any help is greatly appreciated. Also, from looking at the picture, does anyone know who the manufacturer is?